Condensed Consolidated Statements of Redeemable Convertible Preferred Units and Stockholders'/Members' Equity (Deficit) - USD ($) $ in Thousands	Total	Redeemable convertible preferred units	Common Units	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019		1,348,313,000
Beginning balance at Dec. 31, 2019		$ 3,468,554
Increase (Decrease) in Temporary Equity [Roll Forward]
Repurchase of preferred units (in shares)		(7,242,000)
Repurchase of preferred units		$ (1,937)
Ending balance (in shares) at Mar. 31, 2020		1,341,071,000
Ending balance at Mar. 31, 2020		$ 3,466,617
Beginning balance (in shares) at Dec. 31, 2019			70,702,000
Common units, beginning balance at Dec. 31, 2019			$ 0
Beginning balance at Dec. 31, 2019	$ (3,532,912)				$ 25,036	$ 7,642	$ (3,565,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(105,353)						(105,353)
Foreign currency translation adjustments, net of tax	(2,288)					(2,288)
Actuarial (loss) gain on defined severance benefits, net of tax	38					38
Equity-based compensation	6,478		$ 6,478		0
Issuance of common units, equity-based compensation plan (in shares)			5,193,000
Issuance of common units, equity-based compensation plan	5,193		$ 5,193
Repurchase of common units (in shares)			(680,000)
Repurchase of common units	(1,366)		$ (1,366)
Repurchase of preferred units	(34,871)		$ (10,305)				(24,566)
Ending balance (in shares) at Mar. 31, 2020			75,215,000
Common units, ending balance at Mar. 31, 2020			$ 0
Ending balance at Mar. 31, 2020	(3,665,081)				25,036	5,392	(3,695,509)
Beginning balance (in shares) at Dec. 31, 2019		1,348,313,000
Beginning balance at Dec. 31, 2019		$ 3,468,554
Ending balance (in shares) at Jun. 30, 2020		1,329,465,000
Ending balance at Jun. 30, 2020		$ 3,465,611
Beginning balance (in shares) at Dec. 31, 2019			70,702,000
Common units, beginning balance at Dec. 31, 2019			$ 0
Beginning balance at Dec. 31, 2019	(3,532,912)				25,036	7,642	(3,565,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(207,403)
Foreign currency translation adjustments, net of tax	(1,685)
Actuarial (loss) gain on defined severance benefits, net of tax	73
Ending balance (in shares) at Jun. 30, 2020			93,833,000
Common units, ending balance at Jun. 30, 2020			$ 9,965
Ending balance at Jun. 30, 2020	(3,811,142)				25,036	6,030	(3,852,173)
Beginning balance (in shares) at Mar. 31, 2020		1,341,071,000
Beginning balance at Mar. 31, 2020		$ 3,466,617
Increase (Decrease) in Temporary Equity [Roll Forward]
Repurchase of preferred units (in shares)		(11,606,000)
Repurchase of preferred units		$ (1,006)
Ending balance (in shares) at Jun. 30, 2020		1,329,465,000
Ending balance at Jun. 30, 2020		$ 3,465,611
Beginning balance (in shares) at Mar. 31, 2020			75,215,000
Common units, beginning balance at Mar. 31, 2020			$ 0
Beginning balance at Mar. 31, 2020	(3,665,081)				25,036	5,392	(3,695,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(102,050)						(102,050)
Foreign currency translation adjustments, net of tax	603					603
Actuarial (loss) gain on defined severance benefits, net of tax	35					35
Equity-based compensation	10,345		$ 10,345
Issuance of common units, equity-based compensation plan (in shares)			18,618,000
Issuance of common units, equity-based compensation plan	2,869		$ 2,869
Repurchase of preferred units	(57,863)		$ (3,249)				(54,614)
Ending balance (in shares) at Jun. 30, 2020			93,833,000
Common units, ending balance at Jun. 30, 2020			$ 9,965
Ending balance at Jun. 30, 2020	$ (3,811,142)				25,036	6,030	(3,852,173)
Beginning balance (in shares) at Dec. 31, 2020	1,329,464,982	1,329,465,000
Beginning balance at Dec. 31, 2020	$ 3,465,611	$ 3,465,611
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preferred units into Class A and Class B common stock (in shares)		(1,329,465,000)
Conversion of redeemable convertible preferred units into Class A and Class B common stock		$ (3,465,611)
Ending balance (in shares) at Mar. 31, 2021		0
Ending balance at Mar. 31, 2021		$ 0
Beginning balance (in shares) at Dec. 31, 2020			105,822,000	0
Common units, beginning balance at Dec. 31, 2020			$ 45,122
Beginning balance at Dec. 31, 2020	(4,068,862)			$ 0	25,036	(31,093)	(4,107,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(295,033)						(295,033)
Foreign currency translation adjustments, net of tax	14,972					14,972
Actuarial (loss) gain on defined severance benefits, net of tax	918					918
Issuance of common units, equity-based compensation plan (in shares)			22,901,000
Issuance of common units, equity-based compensation plan	38,968		$ 38,968
Equity-based compensation	2,974		$ 2,974
Conversion of common units into Class A and Class B common stock (in shares)			(128,723,000)	(128,648,000)
Conversion of common units into Class A and Class B common stock	0		$ (87,064)	$ (13)	(87,051)
Conversion of redeemable convertible preferred units into Class A and Class B common stock (in shares)				1,329,465,000
Conversion of redeemable convertible preferred units into Class A and Class B common stock	3,465,611			$ 133	3,465,478
Issuance of Class A common stock, net of underwriting discounts and offering costs (in shares)				100,000,000
Issuance of Class A common stock, net of underwriting discounts and offering costs	3,416,819			$ 10	3,416,809
Conversion of convertible notes into Class A common stock				171,750,000
Conversion of convertible notes into Class A common stock	609,999			$ 17	609,982
Issuance of common units, equity-based compensation plan (in shares)				2,680,000
Issuance of common units, equity-based compensation plan	4,767				4,767
Equity-based compensation subsequent to Corporate Conversion and IPO	83,992				83,992
Ending balance (in shares) at Mar. 31, 2021			0	1,732,543,000
Common units, ending balance at Mar. 31, 2021			$ 0
Ending balance at Mar. 31, 2021	$ 3,275,125			$ 173	7,693,115	(15,203)	(4,402,960)
Beginning balance (in shares) at Dec. 31, 2020	1,329,464,982	1,329,465,000
Beginning balance at Dec. 31, 2020	$ 3,465,611	$ 3,465,611
Ending balance (in shares) at Jun. 30, 2021	0	0
Ending balance at Jun. 30, 2021	$ 0	$ 0
Beginning balance (in shares) at Dec. 31, 2020			105,822,000	0
Common units, beginning balance at Dec. 31, 2020			$ 45,122
Beginning balance at Dec. 31, 2020	(4,068,862)			$ 0	25,036	(31,093)	(4,107,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(813,634)
Foreign currency translation adjustments, net of tax	14,621
Actuarial (loss) gain on defined severance benefits, net of tax	(8,974)
Ending balance (in shares) at Jun. 30, 2021			0	1,735,579,000
Common units, ending balance at Jun. 30, 2021			$ 0
Ending balance at Jun. 30, 2021	$ 2,802,629			$ 173	7,749,463	(25,446)	(4,921,561)
Beginning balance (in shares) at Mar. 31, 2021		0
Beginning balance at Mar. 31, 2021		$ 0
Ending balance (in shares) at Jun. 30, 2021	0	0
Ending balance at Jun. 30, 2021	$ 0	$ 0
Beginning balance (in shares) at Mar. 31, 2021			0	1,732,543,000
Common units, beginning balance at Mar. 31, 2021			$ 0
Beginning balance at Mar. 31, 2021	3,275,125			$ 173	7,693,115	(15,203)	(4,402,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(518,601)						(518,601)
Foreign currency translation adjustments, net of tax	(351)					(351)
Actuarial (loss) gain on defined severance benefits, net of tax	(9,892)					(9,892)
Equity-based compensation	50,346				50,346
Issuance of common units, equity-based compensation plan (in shares)				3,036,000
Issuance of common units, equity-based compensation plan	6,002				6,002
Ending balance (in shares) at Jun. 30, 2021			0	1,735,579,000
Common units, ending balance at Jun. 30, 2021			$ 0
Ending balance at Jun. 30, 2021	$ 2,802,629			$ 173	$ 7,749,463	$ (25,446)	$ (4,921,561)