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Fair Value Measurements - Schedule of Changes to Deferred Acquisition Consideration (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Other     $ 4,819,000 $ (8,227,000) $ (38,887,000)
Contingent Payment [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Other $ (18,173,000) $ (9,211,000) (4,896,000) (7,972,000) (36,344,000)
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     224,754,000 306,734,000  
Payments     110,234,000 105,169,000  
Additions     0 16,132,000  
Redemption value adjustments     3,273,000 13,930,000  
Other     0 (6,412,000)  
Foreign translation adjustment     1,293,000 (461,000)  
Ending balance of contingent payments $ 119,086,000 $ 224,754,000 $ 119,086,000 $ 224,754,000 $ 306,734,000