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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
State net operating loss carryforwards $ 20us-gaap_OperatingLossCarryforwards    
Net operating loss carryforwards expiration date, lower limit 2018    
State tax carryforwards 1.5us-gaap_TaxCreditCarryforwardAmount    
Net operating loss carryforwards expiration date, upper limit 2031    
Tax carryforwards, expiration year 2015    
Deferred tax liability 0.9us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings    
Undistributed foreign earnings 2.5us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Expected change in unrecognized tax benefits 2.4us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit    
Accrued interest related to uncertain tax positions 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Increased (decreased) in interest for uncertain tax positions $ (0.1)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense