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Intangible Assets - Summary of Amortization Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 (period from April 1 to December 31) $ 12,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 16,326us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 10,775us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 3,640us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 2,470us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter $ 1,128us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive