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Contract Balances - Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Receivables [Abstract]    
Billed and billable $ 131,494 $ 191,844
Less: allowance for credit losses (2,844) (2,564)
Accounts receivable, net $ 128,650 $ 189,280