Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.20.4
Fair Value Measurements - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, assets, level 3 transfers, amount $ 0  
Contingent and deferred consideration, maximum undiscounted payment $ 33,200,000 $ 7,300,000
Recurring [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out period for contingent and deferred consideration 7 years  
Recurring [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out period for contingent and deferred consideration 1 year