Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 167,273	$ 203,441	$ 620,828	$ 541,052
Other comprehensive income (loss):
Unrecognized gain (loss) on equity investments		0	(5,908)	0	(16,477)
Foreign currency translation gain (loss)		(50,123)	27,713	(33,797)	33,426
Total other comprehensive income (loss)		(50,123)	21,805	(33,797)	16,949
Total comprehensive income (loss)		117,150	225,246	587,031	558,001
Less: Total comprehensive income (loss) attributable to noncontrolling interests(1)	[1]	(7,580)	11,562	(7,258)	15,198
Total comprehensive income (loss) attributable to common stockholders		$ 124,730	$ 213,684	$ 594,289	$ 542,803

[1] Includes amounts attributable to redeemable noncontrolling interests.