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Accounts Receivable, Net - Accounts Receivables Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Receivable Net Current [Abstract]    
Trade accounts receivable $ 109,739 $ 106,282
Unbilled revenue, at net realizable value 43,546 40,498
Total accounts receivable 153,285 146,780
Allowance for doubtful accounts (10,178) (11,801)
Accounts receivable, net $ 143,107 $ 134,979