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Receivables and Concentration of Credit Risk (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]        
Billed Receivables $ 173,100 $ 184,430    
Allowance for doubtful accounts (4,459) (8,117) (4,843) (5,738)
Billed, net 168,641 176,313    
Accrued Receivables 34,934 41,008    
Receivables, net $ 203,575 $ 217,321