CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income		$ 2,551,360	$ 2,421,753	$ 1,892,798
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	[1]	(114,505)	(187,356)	97,970
Unrealized gain (loss) on marketable securities	[2]	619,259	(157,275)	21
Comprehensive income		3,056,114	2,077,122	1,990,789
Less: Comprehensive loss attributable to redeemable noncontrolling interests		0	0	(10,279)
Comprehensive income attributable to common stockholders		3,056,114	2,077,122	2,001,068
Foreign currency translation adjustment for net investment hedges arising during the period, tax (tax benefit)		60,418	55,597	(55,001)
Unrealized gain (loss) on marketable securities arising during period, tax (tax benefit)		$ 1,551	$ (7,621)	$ (43)

[1] Foreign currency translation adjustments includes a tax of $60,418 and $55,597 for the years ended December 31, 2015 and 2014, respectively, and a tax benefit of $55,001 for the year ended December 31, 2013, associated with net investment hedges (See Note 13). The remaining balance in foreign currency translation adjustments excludes income taxes due to the Company's practice and intention to reinvest the earnings of its foreign subsidiaries in those operations (See Note 14).

[2] Net of tax of $1,551 for the year ended December 31, 2015 and net of tax benefits of $7,621 and $43 for the years ended December 31, 2014 and 2013, respectively.