Fair Value Measurements - Schedule of Changes to Deferred Acquisition Consideration (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Other			$ (8,227,000)	$ (38,887,000)	$ (18,652,000)
Contingent Payment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Other	$ 9,211	$ (41,913)	(7,972,000)	(36,344,000)	(16,467,000)
Contingent Payment [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments			306,734,000	172,227,000
Payments			105,169,000	77,301,000
Additions			16,132,000	174,530,000
Redemption value adjustments			13,930,000	41,636,000
Other			(6,412,000)	0
Foreign translation adjustment			(461,000)	(4,358,000)
Ending balance of contingent payments	$ 224,754,000	$ 306,734,000	$ 224,754,000	$ 306,734,000	$ 172,227,000