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Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Billed and billable $ 133,913 $ 200,221
Less: allowance for credit losses (2,397) (2,760)
Accounts receivable, net $ 131,516 $ 197,461