Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues	$ 24,996,056	$ 20,156,447	$ 15,794,341
Cost of revenues	15,276,319	12,440,213	9,967,538
Marketing	2,228,362	2,652,462	2,369,469
Technology and development	1,829,600	1,545,149	1,221,814
General and administrative	1,076,486	914,369	630,294
Operating income	4,585,289	2,604,254	1,605,226
Other income (expense):
Interest expense	(767,499)	(626,023)	(420,493)
Interest and other income (expense)	(618,441)	84,000	41,725
Income before income taxes	3,199,349	2,062,231	1,226,458
Provision for income taxes	(437,954)	(195,315)	(15,216)
Net income	$ 2,761,395	$ 1,866,916	$ 1,211,242
Earnings per share:
Basic (in USD per share)	$ 6.26	$ 4.26	$ 2.78
Diluted (in USD per share)	$ 6.08	$ 4.13	$ 2.68
Weighted-average common shares outstanding:
Basic (in shares)	440,922	437,799	435,374
Diluted (in shares)	454,208	451,765	451,244