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Accounts Receivable, Net - Accounts Receivables Net (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accounts Receivable Net Current [Abstract]    
Trade accounts receivable $ 127,935 $ 109,739
Unbilled revenue 61,422 43,546
Total accounts receivable 189,357 153,285
Allowance for doubtful accounts (10,235) (10,178)
Accounts receivable, net $ 179,122 $ 143,107