Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 1,893,489	$ 2,263,934	$ 2,569,808	$ 2,804,151	$ 2,263,934	$ 2,804,151
Beginning retained earnings adjustment		(101)
Non-cash stock compensation	3,202	1,576	4,621	1,984
Conversion of Class B shares to Class A shares		0		0
Purchase of treasury stock at cost	(105,786)	(145,806)		29,203
Exercise of stock options and vesting of restricted stock, net of shares withheld to satisfy tax withholding	(360)	1,222	32	(25,614)
Reclassification of redeemable noncontrolling interests and equity	(1)
Net loss	(29,224)	(164,943)	(311,628)	98,316	(194,167)	(213,312)
Foreign currency translation adjustment, net of tax of $0	510,443	(59,761)	14,034	(330,116)	450,682	(316,082)
Minimum pension liability adjustment, net of tax of $0	27	(168)	0	(932)	(141)	(932)
Accretion of redemption value of redeemable noncontrolling interests and equity	(68)		201		(88)	157
Reclassification of redeemable noncontrolling interests and equity			(414)
Balance, end of period	2,272,442	1,893,489	2,280,061	2,569,808	2,272,442	2,280,061
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock, net of shares withheld to satisfy tax withholding			(1)
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	3,760,362	3,760,029	3,752,186	3,724,636	3,760,029	3,724,636
Non-cash stock compensation	3,202	1,576	4,621	1,984
Exercise of stock options and vesting of restricted stock, net of shares withheld to satisfy tax withholding	(359)	1,223	33	(25,610)
Balance, end of period	3,763,855	3,760,362	3,756,975	3,752,186	3,763,855	3,756,975
(Accumulated deficit) retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(341,851)	(176,822)	536,124	436,509	(176,822)	436,509
Beginning retained earnings adjustment		(101)
Net loss	(29,000)	(164,928)	(307,823)	99,615
Balance, end of period	(370,851)	(341,851)	228,301	536,124	(370,851)	228,301
Accumulated other comprehensive (loss) income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(1,001,897)	(941,986)	(1,405,788)	(1,073,981)	(941,986)	(1,073,981)
Foreign currency translation adjustment, net of tax of $0	510,445	(59,743)	14,102	(330,875)
Minimum pension liability adjustment, net of tax of $0	27	(168)		(932)
Balance, end of period	(491,425)	(1,001,897)	(1,391,686)	(1,405,788)	(491,425)	(1,391,686)
Treasury stock at cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(511,122)	(365,316)	(300,309)	(271,106)	$ (365,316)	(271,106)
Purchase of treasury stock at cost (in shares)					(17,949,000)
Purchase of treasury stock at cost	(105,786)	(145,806)		29,203
Balance, end of period	(616,908)	(511,122)	(300,309)	(300,309)	$ (616,908)	(300,309)
Non-controlling interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(12,915)	(12,882)	(13,314)	(12,812)	(12,882)	(12,812)
Reclassification of redeemable noncontrolling interests and equity	(1)
Net loss	(224)	(15)	(3,805)	(1,299)
Foreign currency translation adjustment, net of tax of $0	(2)	(18)	(68)	759
Change in noncontrolling interests			3,471
Reclassification of redeemable noncontrolling interests and equity			(414)
Balance, end of period	$ (13,142)	$ (12,915)	$ (14,130)	$ (13,314)	$ (13,142)	$ (14,130)
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)		115,119,000			115,119,000
Balance of shares outstanding, end of period (in shares)	114,786,000				114,786,000
Class A Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)	122,213,000	115,119,000	119,075,000	119,575,000	115,119,000	119,575,000
Balance, beginning of period	$ 618	$ 548	$ 546	$ 542	$ 548	$ 542
Conversion of Class B shares to Class A shares (in shares)		(17,248,000)		(18,000)
Conversion of Class B shares to Class A shares		$ (69)
Purchase of treasury stock at cost (in shares)	(7,548,000)	(10,401,000)		(1,619,000)
Exercise of stock options and vesting of restricted stock, net of shares withheld to satisfy tax withholding (in shares)	119,000	247,000	132,000	1,101,000
Exercise of stock options and vesting of restricted stock, net of shares withheld to satisfy tax withholding	$ (1)	$ (1)		$ (4)
Conversion of Class B shares to Class A shares (in shares)	2,000
Balance of shares outstanding, end of period (in shares)	114,786,000	122,213,000	119,207,000	119,075,000	114,786,000	119,207,000
Balance, end of period	$ 619	$ 618	$ 547	$ 546	$ 619	$ 547
Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)		90,792,000			90,792,000
Balance of shares outstanding, end of period (in shares)	73,542,000				73,542,000
Class B Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)	73,544,000	90,792,000	90,813,000	90,831,000	90,792,000	90,831,000
Balance, beginning of period	$ 294	$ 363	$ 363	$ 363	$ 363	$ 363
Conversion of Class B shares to Class A shares (in shares)		(17,248,000)		(18,000)
Conversion of Class B shares to Class A shares		$ 69
Conversion of Class B shares to Class A shares (in shares)	(2,000)
Balance of shares outstanding, end of period (in shares)	73,542,000	73,544,000	90,813,000	90,813,000	73,542,000	90,813,000
Balance, end of period	$ 294	$ 294	$ 363	$ 363	$ 294	$ 363
Accretion of redeemable noncontrolling interests and equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity				(44)
Accretion of redemption value of redeemable noncontrolling interests and equity			201
Redeemable noncontrolling interests and equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity		(20)
Reclassification of redeemable noncontrolling interests and equity				38
Change in noncontrolling interests	(68)		$ 3,471
Redeemable noncontrolling interests and equity | Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity		$ (20)
Change in noncontrolling interests	$ (68)
Redeemable noncontrolling interests and equity | Non-controlling interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of redeemable noncontrolling interests and equity				$ 38