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Goodwill and Other Intangible Assets (Detail) - Amortization of Other Intangible Assets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]        
2015 $ 3,920us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths      
2016 3,843us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo      
2017 3,063us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree      
2018 2,138us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
2019 2,073us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive      
2020 and thereafter 8,573us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive      
Total $ 23,610us-gaap_FiniteLivedIntangibleAssetsNet $ 12,304us-gaap_FiniteLivedIntangibleAssetsNet $ 15,582us-gaap_FiniteLivedIntangibleAssetsNet $ 18,173us-gaap_FiniteLivedIntangibleAssetsNet