Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Class A Common Stock	Class B Common Stock	Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional paid-in capital	(Accumulated deficit) retained earnings	(Accumulated deficit) retained earnings Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated other comprehensive (loss) income	Treasury stock at cost	Non-controlling interests	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment (Accumulated deficit) retained earnings	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock Class A Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock Class B Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional paid-in capital	Cumulative Effect, Period of Adoption, Adjusted Balance (Accumulated deficit) retained earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated other comprehensive (loss) income	Cumulative Effect, Period of Adoption, Adjusted Balance Treasury stock at cost	Cumulative Effect, Period of Adoption, Adjusted Balance Non-controlling interests
Balance of beginning of period (in shares) at Dec. 31, 2018						107,450,000	116,865,000										107,450,000	116,865,000
Balance, beginning of period at Dec. 31, 2018	$ 2,050,946					$ 430	$ 467	$ 3,703,796	$ (530,919)		$ (1,112,695)	$ 0	$ (10,133)	$ 28,944	$ 28,944	$ 2,079,890	$ 430	$ 467	$ 3,703,796	$ (501,975)	$ (1,112,695)	$ 0	$ (10,133)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash stock compensation	12,994							12,994
Conversion of Class B Shares into Class A Shares (in shares)						26,034,000	26,034,000
Conversion of Class B shares to Class A shares	0					$ 104	$ (104)
Purchase of treasury stock at cost (in shares)						(16,008,000)
Purchase of treasury stock at cost	(271,106)											(271,106)
Exercise of stock options and vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding (in shares)						2,099,000
Exercise of stock options and vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding	11,762					$ 8		11,754
Distributions from/to noncontrolling interest holders	(1,356)												(1,356)
Change in noncontrolling interests	(3,700)							(3,700)
Accretion of redeemable noncontrolling interests and equity	(208)							(208)
Reclassification of redeemable noncontrolling interests and equity	(370)												(370)
Net Income (Loss)	937,664								938,484				(820)
Foreign currency translation adjustment, net of tax of $0 for all years	42,935										43,068		(133)
Unrealized loss on derivatives, net of tax	(7,950)										(7,950)
Minimum pension liability adjustment, net of tax of $0 for all years	3,596										3,596
Balance of end of period (in shares) at Dec. 31, 2019						119,575,000	90,831,000
Balance, end of period at Dec. 31, 2019	2,804,151					$ 542	$ 363	3,724,636	436,509		(1,073,981)	(271,106)	(12,812)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash stock compensation	13,298							13,298
Conversion of Class B Shares into Class A Shares (in shares)						39,000	39,000
Conversion of Class B shares to Class A shares	0
Purchase of treasury stock at cost (in shares)						(6,035,000)
Purchase of treasury stock at cost	(94,210)											(94,210)
Exercise of stock options and vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding (in shares)						1,540,000
Exercise of stock options and vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding	24,562					$ 6		24,556
Change in noncontrolling interests	861							(2,610)					3,471
Accretion of redeemable noncontrolling interests and equity	149							149
Reclassification of redeemable noncontrolling interests and equity	1,198												1,198
Net Income (Loss)	(618,702)								(613,331)				(5,371)
Foreign currency translation adjustment, net of tax of $0 for all years	133,827										133,195		632
Minimum pension liability adjustment, net of tax of $0 for all years	$ (1,200)										(1,200)
Balance of end of period (in shares) at Dec. 31, 2020	0		115,119,000	90,792,000		115,119,000	90,792,000
Balance, end of period at Dec. 31, 2020	$ 2,263,934	$ (101)				$ 548	$ 363	3,760,029	(176,822)	$ (101)	(941,986)	(365,316)	(12,882)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash stock compensation	10,172							10,172
Conversion of Class B Shares into Class A Shares (in shares)					181,289,000	90,497,000	90,792,000
Conversion of Class B shares to Class A shares	0				$ 913	$ (550)	$ (363)
Purchase of treasury stock at cost (in shares)					(974,000)	(25,203,000)
Purchase of treasury stock at cost	(378,858)											(378,858)
Exercise of stock options and vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding (in shares)					296,000	581,000
Exercise of stock options and vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding	642					$ 2		638
Distributions from/to noncontrolling interest holders	(1,381,787)							(1,381,787)
Change in noncontrolling interests	90							(181)					271
Accretion of redeemable noncontrolling interests and equity	(88)							(88)
Reclassification of redeemable noncontrolling interests and equity	(1)												(1)
Net Income (Loss)	203,785								192,446				11,339
Foreign currency translation adjustment, net of tax of $0 for all years	421,972										421,984		(12)
Minimum pension liability adjustment, net of tax of $0 for all years	$ (202)										(202)
Balance of end of period (in shares) at Dec. 31, 2021	180,611,000				180,611,000	0	0
Balance, end of period at Dec. 31, 2021	$ 1,139,558				$ 915	$ 0	$ 0	$ 2,388,783	$ 15,523		$ (520,204)	$ (744,174)	$ (1,285)