Goodwill and Intangible Assets - Summary of Amortization Expense Associated with Intangible Assets (Details) $ in Thousands	Jun. 30, 2016 USD ($)	[1]
Estimated future amortization expense [Abstract]
Remainder of 2016	$ 46,338
2017	100,437
2018	98,976
2019	98,115
2020	86,935
Thereafter	$ 760,414

[1] The functional currency of certain foreign subsidiaries differs from the U.S. Dollar, so these amounts are subject to change as exchange rates fluctuate.