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Income Taxes - Differences Between Income Tax Provisions and Provisions for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Expected tax at statutory rate $ 13,272us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 4,940us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 7,377us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign taxes at other rates (9,107)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (2,520)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (2,513)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
US tax on foreign earnings, net of foreign tax credits (9)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 212us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings  
State income taxes, net of federal benefit 140us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (310)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 53us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Disallowed expenses and other 1,013us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 825us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 551us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Total $ 5,309us-gaap_IncomeTaxExpenseBenefit $ 3,147us-gaap_IncomeTaxExpenseBenefit $ 5,468us-gaap_IncomeTaxExpenseBenefit