Goodwill and Other Intangible Assets - Summary of Amortization Expense Associated with Intangible Assets (Details) $ in Thousands	Dec. 31, 2015 USD ($)	[1]
Estimated future amortization expense [Abstract]
2016	$ 86,310
2017	85,247
2018	84,951
2019	85,828
2020	77,570
Thereafter	$ 842,758

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