Quarterly report pursuant to Section 13 or 15(d)

Investments in Marketable Debt Securities, Available-for-Sale - Narrative (Detail)

v3.22.2.2
Investments in Marketable Debt Securities, Available-for-Sale - Narrative (Detail)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Weighted average contractual maturity 1 year 3 months 18 days 1 year 6 months
Fitch, AA Rating | Moody's, Aaa Rating | Standard & Poor's, AA Rating    
Schedule of Available-for-sale Securities [Line Items]    
Weighted average contractual maturity 1 year 3 months 18 days  
Fitch, AA+ Rating | Moody's, Aa3 Rating | Standard & Poor's, AA+ Rating | Weighted Average Credit AA Plus Rating    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, securities number of unrealized loss positions | security 223  
Available-for-sale, securities in unrealized loss positions, accumulated loss | $ $ 6.7  
Percentage of amortized cost 2.00%