v3.22.2.2
Investment Securities - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Investment securities, available-for-sale $ 529,355 $ 319,968
Aggregate related fair value of investments with unrealized losses 511,200 263,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 403,000 254,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 108,200 9,500
Cash and Cash Equivalents [Member]    
Debt Securities, Available-for-sale [Line Items]    
Commercial Paper, at Carrying Value 36,000 0
Contractual Maturity More Than One Year And Less Than Two Years [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities, available-for-sale 90,700 67,200
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities, available-for-sale 181,209 71,652
Aggregate related fair value of investments with unrealized losses 170,500  
Commercial Paper [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities, available-for-sale 124,671 55,919
Aggregate related fair value of investments with unrealized losses 124,700  
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities, available-for-sale 212,871 166,164
Aggregate related fair value of investments with unrealized losses 212,900  
Certificates of Deposit [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities, available-for-sale 7,500 $ 26,233
Aggregate related fair value of investments with unrealized losses $ 3,100