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Income Taxes - Provision for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
U.S. Federal $ 7,494us-gaap_CurrentFederalTaxExpenseBenefit $ 1,188us-gaap_CurrentFederalTaxExpenseBenefit $ 1,634us-gaap_CurrentFederalTaxExpenseBenefit
State 2,139us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,803us-gaap_CurrentStateAndLocalTaxExpenseBenefit 653us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 1,572us-gaap_CurrentForeignTaxExpenseBenefit 2,217us-gaap_CurrentForeignTaxExpenseBenefit 2,599us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense (benefit) 11,205us-gaap_CurrentIncomeTaxExpenseBenefit 5,208us-gaap_CurrentIncomeTaxExpenseBenefit 4,886us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
U.S. Federal 17,986us-gaap_DeferredFederalIncomeTaxExpenseBenefit 21,067us-gaap_DeferredFederalIncomeTaxExpenseBenefit 20,952us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 1,927us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,818us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,252us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign (266)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (116)us-gaap_DeferredForeignIncomeTaxExpenseBenefit  
Deferred income tax expense (benefit) 19,647us-gaap_DeferredIncomeTaxExpenseBenefit 22,769us-gaap_DeferredIncomeTaxExpenseBenefit 23,204us-gaap_DeferredIncomeTaxExpenseBenefit
Total $ 30,852us-gaap_IncomeTaxExpenseBenefit $ 27,977us-gaap_IncomeTaxExpenseBenefit $ 28,090us-gaap_IncomeTaxExpenseBenefit