Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 20,156,447	$ 15,794,341	$ 11,692,713
Cost of revenues	12,440,213	9,967,538	8,033,000
Marketing	2,652,462	2,369,469	1,436,281
Technology and development	1,545,149	1,221,814	953,710
General and administrative	914,369	630,294	431,043
Operating income	2,604,254	1,605,226	838,679
Other income (expense):
Interest expense	(626,023)	(420,493)	(238,204)
Interest and other income (expense)	84,000	41,725	(115,154)
Income before income taxes	2,062,231	1,226,458	485,321
Provision for (benefit from) income taxes	195,315	15,216	(73,608)
Net income	$ 1,866,916	$ 1,211,242	$ 558,929
Earnings per share:
Basic (in USD per share)	$ 4.26	$ 2.78	$ 1.29
Diluted (in USD per share)	$ 4.13	$ 2.68	$ 1.25
Weighted-average common shares outstanding:
Basic (in shares)	437,799	435,374	431,885
Diluted (in shares)	451,765	451,244	446,814