Redeemable Non-controlling Interests - Reconciliation of Redeemable Non-controlling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 658,478	$ 560,073	$ 364,871
Acquisition of redeemable non-controlling interest	0	6,829	0
Purchase of subsidiary shares at fair value	(7,054)	0	0
Net loss attributable to non-controlling interests	(22,286)	(15,417)	(9,690)
Fair value adjustments	848,885	188,579	259,984
Currency translation adjustments	(89,436)	(90,244)	(57,853)
Other	(7,611)	8,658	2,761
Transfer to non-redeemable non-controlling interest	(1,380,976)	0	0
Ending balance	$ 0	$ 658,478	$ 560,073