Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held in rabbi trust $ 10,916 $ 11,508    
Marketable debt securities, available-for-sale 271,968 296,478    
Deferred consideration 8,371 9,801    
Deferred compensation liability 8,539 8,001    
Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 218,988 183,868    
Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 52,980 112,610    
U.S. Treasuries [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 100,292 35,733    
U.S. Treasuries [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 12,118 70,767    
U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 656 745    
Corporate debt securities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 118,085 148,135    
Corporate debt securities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 33,306 34,013    
Asset-backed securities and other [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 611      
Asset-backed securities and other [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 6,900 7,085    
Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 83,626 219,933    
Recurring [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 218,988 183,868    
Recurring [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 52,980 112,610    
Recurring [Member] | Commercial Paper [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 32,223 8,948    
Recurring [Member] | Money market funds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 51,403 210,985    
Recurring [Member] | Assets held in rabbi trust [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held in rabbi trust 10,916 11,508    
Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 100,292 35,733    
Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 12,118 70,767    
Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 656 745    
Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 118,085 0    
Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 33,306 34,013    
Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 611 148,135    
Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 6,900 7,085    
Level 1 [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 51,403 210,985    
Deferred consideration 0 0    
Deferred compensation liability 8,539 8,001    
Level 1 [Member] | Recurring [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 100,292 35,733    
Level 1 [Member] | Recurring [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 12,118 70,767    
Level 1 [Member] | Recurring [Member] | Commercial Paper [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Level 1 [Member] | Recurring [Member] | Money market funds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 51,403 210,985    
Level 1 [Member] | Recurring [Member] | Assets held in rabbi trust [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held in rabbi trust 0 0    
Level 1 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 100,292 35,733    
Level 1 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 12,118 70,767    
Level 1 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 1 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 1 [Member] | Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 1 [Member] | Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 1 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 1 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 2 [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 32,223 8,948    
Deferred consideration 8,371 9,801    
Deferred compensation liability 0 0    
Level 2 [Member] | Recurring [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 118,696 148,135    
Level 2 [Member] | Recurring [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 40,862 41,843    
Level 2 [Member] | Recurring [Member] | Commercial Paper [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 32,223 8,948    
Level 2 [Member] | Recurring [Member] | Money market funds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Level 2 [Member] | Recurring [Member] | Assets held in rabbi trust [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held in rabbi trust 10,916 11,508    
Level 2 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 2 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 2 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 2 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 656 745    
Level 2 [Member] | Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 118,085 0    
Level 2 [Member] | Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 33,306 34,013    
Level 2 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 611 148,135    
Level 2 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 6,900 7,085    
Level 3 [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Deferred consideration 0 0    
Deferred compensation liability 0 0    
Level 3 [Member] | Recurring [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | Commercial Paper [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Level 3 [Member] | Recurring [Member] | Money market funds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0 0    
Level 3 [Member] | Recurring [Member] | Assets held in rabbi trust [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held in rabbi trust 0 0    
Level 3 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Level 3 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable debt securities, available-for-sale 0 0    
Contingent Consideration [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 9,363 9,312 $ 5,301 $ 5,572
Contingent Consideration [Member] | Level 1 [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 0 0    
Contingent Consideration [Member] | Level 2 [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 0 0    
Contingent Consideration [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration $ 9,363 $ 9,312