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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill And Intangible Assets [Line Items]      
Amortization expense related to finite lived intangible assets $ 5,769us-gaap_AmortizationOfIntangibleAssets $ 6,029us-gaap_AmortizationOfIntangibleAssets $ 4,925us-gaap_AmortizationOfIntangibleAssets
Amortization of finite lived intangible assets for 2015 5,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Amortization of finite lived intangible assets for 2016 5,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization of finite lived intangible assets for 2017 5,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization of finite lived intangible assets for 2018 5,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization of finite lived intangible assets for 2019 $ 5,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive