Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net revenue	$ 932,714	$ 711,735	$ 1,793,364	$ 1,349,422
Costs and expenses:
Cost of revenue (exclusive of depreciation and amortization shown separately below)	120,526	100,086	238,054	188,492
Sales and marketing	308,466	261,271	610,252	490,907
Product development	235,932	190,133	473,552	355,713
General and administrative	133,940	142,389	261,590	239,702
Depreciation and amortization	139,401	99,004	281,686	172,976
Total costs and expenses	938,265	792,883	1,865,134	1,447,790
Loss from operations	(5,551)	(81,148)	(71,770)	(98,368)
Other expense, net:
Interest income	5,974	2,017	10,947	4,002
Interest expense	(12,916)	(12,694)	(25,757)	(25,291)
Other, net	(5,601)	(1,723)	(9,791)	(5,758)
Other expense, net	(12,543)	(12,400)	(24,601)	(27,047)
Loss before income taxes	(18,094)	(93,548)	(96,371)	(125,415)
Provision (benefit) for income taxes	100,646	(26,048)	67,685	(15,476)
Net loss	(118,740)	(67,500)	(164,056)	(109,939)
Accretion of redeemable noncontrolling interest	(525)	(248)	(1,036)	(357)
Net loss attributable to common stockholders	$ (119,265)	$ (67,748)	$ (165,092)	$ (110,296)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.89)	$ (0.53)	$ (1.24)	$ (0.87)
Diluted (in dollars per share)	$ (0.89)	$ (0.53)	$ (1.24)	$ (0.87)
Weighted-average shares used to compute net loss per share attributable to common stockholders:
Basic (in shares)	134,132	128,241	133,073	126,864
Diluted (in shares)	134,132	128,241	133,073	126,864