XML 54 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Billed and billable $ 176,848 $ 169,554
Less: allowance for doubtful accounts (5,489) (4,190)
Accounts receivable, net $ 171,359 $ 165,364