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Patents - Estimated Future Amortization Expense of Patents (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Finite Lived Intangible Assets Net [Abstract]  
2015 $ 31,290us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 24,124us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 13,516us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 10,649us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 9,582us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Estimated future amortization expense of patents $ 89,161us-gaap_FiniteLivedIntangibleAssetsNet