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Estimated Future Amortization of Acquired Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]    
2015 $ 14,102us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 13,344us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 12,068us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 12,068us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 10,656us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 102,425us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Amortizable intangible assets, Net Carrying Value $ 164,663us-gaap_FiniteLivedIntangibleAssetsNet $ 178,765us-gaap_FiniteLivedIntangibleAssetsNet