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Summary of Significant Accounting Policies - Schedule of Estimated Amortization Expense, Related to Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Abstract]  
2016 $ 192,618
2017 185,093
2018 180,220
2019 164,541
2020 154,122
Total of amortization expense, related to intangible assets $ 876,594