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Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current      
Federal $ 0us-gaap_CurrentFederalTaxExpenseBenefit    
State 307us-gaap_CurrentStateAndLocalTaxExpenseBenefit 353us-gaap_CurrentStateAndLocalTaxExpenseBenefit 360us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 4,352us-gaap_CurrentForeignTaxExpenseBenefit 9,637us-gaap_CurrentForeignTaxExpenseBenefit  
Deferred - principally Federal 15,768us-gaap_DeferredFederalIncomeTaxExpenseBenefit 21,195us-gaap_DeferredFederalIncomeTaxExpenseBenefit 15,632us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total $ 20,427us-gaap_IncomeTaxExpenseBenefit $ 31,185us-gaap_IncomeTaxExpenseBenefit $ 15,992us-gaap_IncomeTaxExpenseBenefit