XML 39 R28.htm IDEA: XBRL DOCUMENT v3.19.2
Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Billed and billable $ 133,443 $ 176,848
Less: allowance for doubtful accounts (4,299) (5,489)
Accounts receivable, net $ 129,144 $ 171,359