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Receivables and Concentration of Credit Risk (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]        
Billed Receivables $ 200,392us-gaap_AccountsReceivableGrossCurrent $ 173,100us-gaap_AccountsReceivableGrossCurrent    
Allowance for doubtful accounts (4,806)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (4,459)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (8,117)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (4,843)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Billed, net 195,586us-gaap_ReceivablesNetCurrent 168,641us-gaap_ReceivablesNetCurrent    
Accrued Receivables 31,520us-gaap_UnbilledReceivablesCurrent 34,934us-gaap_UnbilledReceivablesCurrent    
Receivables, net $ 227,106us-gaap_AccountsReceivableNetCurrent $ 203,575us-gaap_AccountsReceivableNetCurrent