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Accounts Receivable, Net - Accounts Receivables Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts Receivable, Net, Current [Abstract]        
Trade accounts receivable $ 118,916 $ 107,174    
Unbilled revenue, at net realizable value 47,351 47,789    
Total accounts receivable 166,267 154,963    
Allowance for doubtful accounts (12,659) (11,915) $ (9,975) $ (11,363)
Accounts receivable, net $ 153,608 $ 143,048