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Accounts Receivable, Net - Accounts Receivables Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accounts Receivable Net Current [Abstract]    
Trade accounts receivable $ 136,653 $ 118,916
Unbilled revenue 70,190 47,351
Total accounts receivable 206,843 166,267
Allowance for doubtful accounts (13,688) (12,659)
Accounts receivable, net $ 193,155 $ 153,608