Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Aug. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Principal amount of outstanding notes and other debt	$ 4,162,697	$ 4,167,967
Estimated fair value of future contingent consideration	90,719	$ 98,600	$ 98,600
Payments of contingent consideration	18,791
Increase in fair value of contingent consideration liability	10,910
Prices with Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notes and other debt, fair value	$ 4,240,000