CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 2,421,753		$ 1,892,798		$ 1,424,037
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(187,356)	[1]	97,970	[1]	69,683	[1]
Unrealized gain (loss) on marketable securities	(157,275)	[2]	21	[2]	(620)	[2]
Comprehensive income	2,077,122		1,990,789		1,493,100
Less: Comprehensive income (loss) attributable to redeemable noncontrolling interests	0		(10,279)		9,628
Comprehensive income attributable to common stockholders	2,077,122		2,001,068		1,483,472
Foreign currency translation adjustment for net investment hedges arising during the period, tax (tax benefit)	55,597		(55,001)		(18,001)
Unrealized gain (loss) on marketable securities arising during period, tax (tax benefit)	$ (7,621)		$ (43)		$ (158)

[1] Foreign currency translation adjustments includes a tax of $55,597 for the year ended December 31, 2014 and tax benefits of $55,001 and $18,001 for the years ended December 31, 2013 and 2012, respectively, associated with hedges of foreign denominated net assets (See Note 14). The remaining balance in 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 15).

[2] Net of tax benefits of $7,621, $43 and $158 for the years ended December 31, 2014, 2013 and 2012, respectively.