Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($) shares in Thousands		3 Months Ended						9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period		$ 3,107,083,000	$ 2,327,906,000	$ 2,050,946,000	$ 2,115,106,000	$ 1,767,473,000	$ 1,587,282,000	$ 2,050,946,000	$ 1,587,282,000
Adoption of accounting standards										$ 28,944,000	$ 5,074,000
Balance, adjusted										2,079,890,000	1,592,356,000
Non-cash stock compensation		1,578,000	4,854,000	3,149,000	6,561,000	7,687,000	(3,756,000)
Conversion of Class B shares to Class A shares		0
Vesting of restricted stock, net of shares withheld to satisfy tax withholding		1,455,000	170,000	(1,420,000)		(941,000)	(803,000)
Purchases of treasury stock at cost		(104,849,000)
Distributions to noncontrolling interest holders			(731,000)	(625,000)		(1,473,000)	581,000
Change in noncontrolling interests			(3,700,000)			(2,730,000)	(21,043,000)
Accretion of redeemable noncontrolling interests and equity		(193,000)						0	(61,974,000)
Accretion of Series A Preferred Stock		(193,000)			324,000			264,000	1,130,000
Other						(744,000)
Reclassification of Series A Preferred Stock upon conversion						238,101,000
Reclassification of redeemable noncontrolling interests and equity		649,000	(855,000)	224,000	(328,000)	(19,000)	38,000
Net income (loss)		(96,794,000)	779,616,000	194,265,000	(96,684,000)	223,956,000	171,545,000	877,087,000	298,814,000
Foreign currency translation adjustment, net of tax of $0		(82,580,000)	10,188,000	49,551,000	(52,750,000)	(196,672,000)	83,369,000	(22,841,000)	(166,052,000)
Unrealized gain on derivatives, net of tax of $0					(560,000)	10,126,000	2,210,000		11,776,000
Unrealized loss on derivatives, net of tax of $0		0	(10,559,000)	2,609,000				(7,950,000)
Minimum pension liability adjustment, net of tax of $0		4,531,000			0		376,000	4,531,000	376,000
Balance, end of period	$ 2,830,880,000	2,830,880,000	3,107,083,000	2,327,906,000	1,971,669,000	2,115,106,000	1,767,473,000	2,830,880,000	1,971,669,000
Foreign currency translation adjustment, tax		0	0	0	0	0	0	0	0
Unrealized gain on derivative instruments, tax			0	0
Unrealized gain on derivative instruments, tax					0	0	0		0
Pension adjustment, tax		0			0		0	0	0
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period		3,707,305,000	3,705,787,000	3,703,796,000	3,698,822,000	3,383,778,000	3,446,206,000	3,703,796,000	3,446,206,000
Balance, adjusted										3,703,796,000	3,446,206,000
Non-cash stock compensation		1,578,000	4,854,000	3,149,000	6,561,000	7,687,000	(3,756,000)
Vesting of restricted stock, net of shares withheld to satisfy tax withholding		1,455,000	170,000	(1,421,000)		(942,000)	(804,000)
Change in noncontrolling interests			(3,700,000)				(468,000)
Accretion of redeemable noncontrolling interests and equity		(193,000)
Reclassification of Series A Preferred Stock upon conversion						237,957,000
Balance, end of period	3,710,145,000	3,710,145,000	3,707,305,000	3,705,787,000	3,705,707,000	3,698,822,000	3,383,778,000	3,710,145,000	3,705,707,000
(Accumulated deficit) retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period		470,860,000	(310,732,000)	(530,919,000)	(548,615,000)	(772,283,000)	(946,236,000)	(530,919,000)	(946,236,000)
Adoption of accounting standards										28,944,000	5,074,000
Balance, adjusted										(501,975,000)	(941,162,000)
Other						(744,000)
Net income (loss)		(95,226,000)	781,592,000	191,243,000	(94,789,000)	224,412,000	168,879,000
Balance, end of period	375,634,000	375,634,000	470,860,000	(310,732,000)	(643,404,000)	(548,615,000)	(772,283,000)	375,634,000	(643,404,000)
Accumulated other comprehensive (loss) income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period		(1,060,849,000)	(1,060,565,000)	(1,112,695,000)	(1,026,339,000)	(839,322,000)	(925,556,000)	(1,112,695,000)	(925,556,000)
Balance, adjusted										(1,112,695,000)	(925,556,000)
Foreign currency translation adjustment, net of tax of $0		(82,070,000)	10,275,000	49,521,000	(52,961,000)	(197,143,000)	83,648,000
Unrealized gain on derivatives, net of tax of $0					(560,000)	10,126,000	2,210,000
Unrealized loss on derivatives, net of tax of $0			(10,559,000)	2,609,000
Minimum pension liability adjustment, net of tax of $0		4,531,000					376,000
Balance, end of period	(1,138,388,000)	(1,138,388,000)	(1,060,849,000)	(1,060,565,000)	(1,079,860,000)	(1,026,339,000)	(839,322,000)	(1,138,388,000)	(1,079,860,000)
Treasury stock at cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period		0	0	0				0
Purchases of treasury stock at cost		(104,849,000)
Balance, end of period	(104,849,000)	(104,849,000)	0	0				(104,849,000)
Non-controlling interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period		(11,131,000)	(7,482,000)	(10,133,000)	(9,658,000)	(5,451,000)	12,118,000	(10,133,000)	12,118,000
Balance, adjusted										(10,133,000)	12,118,000
Distributions to noncontrolling interest holders			(731,000)	(625,000)		(1,473,000)	581,000
Change in noncontrolling interests						(2,730,000)	(20,575,000)
Reclassification of redeemable noncontrolling interests and equity		649,000	(855,000)	224,000	(328,000)	(19,000)	38,000
Net income (loss)		(1,568,000)	(1,976,000)	3,022,000	(1,895,000)	(456,000)	2,666,000
Foreign currency translation adjustment, net of tax of $0		(510,000)	(87,000)	30,000	211,000	471,000	(279,000)
Balance, end of period	$ (12,560,000)	$ (12,560,000)	$ (11,131,000)	$ (7,482,000)	$ (11,670,000)	$ (9,658,000)	$ (5,451,000)	$ (12,560,000)	$ (11,670,000)
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)				107,450				107,450
Purchases of treasury stock at cost (in shares)	(5,130)	(6,150)
Purchases of treasury stock at cost	$ (87,921,000)	$ (104,849,000)
Balance of shares outstanding, end of period (in shares)	127,754	127,754						127,754
Class A Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)		118,806	107,783	107,450	91,614	55,256	55,052	107,450	55,052
Balance, beginning of period		$ 475,000	$ 431,000	$ 430,000	$ 366,000	$ 221,000	$ 220,000	$ 430,000	$ 220,000
Balance, adjusted										430,000	220,000
Conversion of Class B shares to Class A shares (in shares)		15,002	10,991	8	29	27	59
Conversion of Class B shares to Class A shares		$ 60,000	$ 44,000
Vesting of restricted stock, net of shares withheld to satisfy tax withholding (in shares)		96	32	325	11	188	145
Vesting of restricted stock, net of shares withheld to satisfy tax withholding				$ 1,000		$ 1,000	$ 1,000
Purchases of treasury stock at cost (in shares)		(6,150)
Reclassification of Series A Preferred Stock upon conversion (in shares)						36,143
Reclassification of Series A Preferred Stock upon conversion						$ 144,000
Balance of shares outstanding, end of period (in shares)	127,754	127,754	118,806	107,783	91,654	91,614	55,256	127,754	91,654
Balance, end of period	$ 535,000	$ 535,000	$ 475,000	$ 431,000	$ 366,000	$ 366,000	$ 221,000	$ 535,000	$ 366,000
Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)				116,865				116,865
Balance of shares outstanding, end of period (in shares)	90,864	90,864						90,864
Class B Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance of shares outstanding, beginning of period (in shares)		105,866	116,857	116,865	132,416	132,443	132,443	116,865	132,443
Balance, beginning of period		$ 423,000	$ 467,000	$ 467,000	$ 530,000	$ 530,000	$ 530,000	$ 467,000	$ 530,000
Balance, adjusted										$ 467,000	$ 530,000
Conversion of Class B shares to Class A shares (in shares)		(15,002)	(10,991)	(8)	(29)	(27)	(59)
Conversion of Class B shares to Class A shares		$ (60,000)	$ (44,000)
Vesting of restricted stock, net of shares withheld to satisfy tax withholding (in shares)						0	59
Balance of shares outstanding, end of period (in shares)	90,864	90,864	105,866	116,857	132,387	132,416	132,443	90,864	132,387
Balance, end of period	$ 363,000	$ 363,000	$ 423,000	$ 467,000	$ 530,000	$ 530,000	$ 530,000	$ 363,000	$ 530,000
Redeemable noncontrolling interests and equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity			194,000	263,000	324,000	882,000	(76,000)
Redeemable noncontrolling interests and equity | Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity			$ 194,000	$ 263,000	$ 324,000	882,000	(76,000)
Series A Convertible Redeemable Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity						(74,110,000)
Accretion of Series A Preferred Stock						(4,650,000)
Accretion of Series A Convertible Redeemable Preferred Stock							$ (57,324,000)
Series A Convertible Redeemable Preferred Stock | Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of redeemable noncontrolling interests and equity						$ (74,110,000)