CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Non-controlling Interest	Retained Earnings [Member]	Common Class A Common Stock	Common Class B Common Stock
Beginning balance at Dec. 31, 2017	$ 5,504,753	$ 5,503,214	$ 4,665,229		$ (10,022)	$ 1,539	$ 840,636	$ 2,470	$ 4,901
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	(128,951)	(128,951)					(128,951)
Net loss (income) attributable to noncontrolling interests	2					2
Share-based compensation expense	21,623	21,623	21,623
Change in redeemable equity	(3,347)	(3,347)	(3,347)
Other changes to equity	(859)	(859)	(859)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	3,765	3,765			3,765
Ending balance at Mar. 31, 2018	5,396,986	5,395,445	4,682,646		(8,420)	1,541	713,848	2,470	4,901
Beginning balance at Dec. 31, 2017	5,504,753	5,503,214	4,665,229		(10,022)	1,539	840,636	2,470	4,901
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	(194,253)
Net loss (income) attributable to noncontrolling interests	1,039
Foreign currency translation adjustment, net of income taxes	986
Ending balance at Sep. 30, 2018	3,670,973	3,662,400	3,618,709		(2,291)	8,573	38,744	5,107	2,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU No. 2018-02 | ASU No. 2018-02					(2,163)		2,163
Beginning balance at Mar. 31, 2018	5,396,986	5,395,445	4,682,646		(8,420)	1,541	713,848	2,470	4,901
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	(97,855)	(97,855)					(97,855)
Net loss (income) attributable to noncontrolling interests	(149)
Foreign currency translation adjustment, net of income taxes	576
Share-based compensation expense	12,226	12,226	12,226
Redeemable equity vested	111,521	111,521	111,521
Change in redeemable equity	47,049	47,049	47,049
Conversion of Class B to Class A shares								2,458	(2,458)
Shares issued in connection with acquisition	(15,049)	(15,049)	61,049		(2,520)		(73,578)
Contributions from noncontrolling interests	5,995
Dividend payment	(1,499,935)	(1,499,935)	(963,711)				(536,224)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	(74)
Ending balance at Jun. 30, 2018	3,867,193	3,859,806	3,856,682		(10,438)	7,387	6,191	4,928	2,443
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	32,553	32,553					32,553
Net loss (income) attributable to noncontrolling interests	1,186
Foreign currency translation adjustment, net of income taxes	410
Share-based compensation expense	12,327	12,327	12,327
Redeemable equity vested	12,894	12,894	12,894
Change in redeemable equity	22,528	22,528	22,528
Class A shares acquired through share repurchase program and retired	(240,799)	(240,799)	(240,666)					(133)
Conversion of Class B to Class A shares								312	(312)
Shares issued in connection with acquisition	680	680			680
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	7,057
Ending balance at Sep. 30, 2018	3,670,973	3,662,400	3,618,709		(2,291)	8,573	38,744	5,107	2,131
Beginning balance at Dec. 31, 2018	3,680,236	3,670,941	3,423,803	$ 0	(11,783)	9,295	251,830	4,961	2,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	(24,999)	(24,999)					(24,999)
Net loss (income) attributable to noncontrolling interests	(199)					(199)
Distributions from noncontrolling interests	(1,000)					(1,000)
Foreign currency translation adjustment, net of income taxes	(181)	(181)			(181)
Share-based compensation expense	13,790	13,790	13,790
Redeemable equity vested	1,364	1,364	1,364
Change in redeemable equity	(61,696)	(61,696)	(61,696)
Class A shares acquired through share repurchase program and retired	(600,001)	(600,001)	(599,707)					(294)
Conversion of Class B to Class A shares								242	(242)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	3,752	3,752			3,752
Ending balance at Mar. 31, 2019	3,011,066	3,002,970	2,777,554	0	(8,212)	8,096	226,831	4,909	1,888
Beginning balance at Dec. 31, 2018	3,680,236	3,670,941	3,423,803	0	(11,783)	9,295	251,830	4,961	2,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	138,607
Net loss (income) attributable to noncontrolling interests	1
Foreign currency translation adjustment, net of income taxes	(704)
Ending balance at Sep. 30, 2019	2,089,267	2,080,971	1,709,685	0	(25,520)	8,296	390,437	4,506	1,863
Beginning balance at Mar. 31, 2019	3,011,066	3,002,970	2,777,554	0	(8,212)	8,096	226,831	4,909	1,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	86,367	86,367					86,367
Net loss (income) attributable to noncontrolling interests	43					43
Foreign currency translation adjustment, net of income taxes	(243)	(243)			(243)
Share-based compensation expense	16,077	16,077	16,077
Redeemable equity vested	61,702	61,702	61,702
Change in redeemable equity	(46,294)	(46,294)	(46,294)
Class A shares acquired through share repurchase program and retired	(599,952)	(599,952)	(599,703)					(249)
Conversion of Class B to Class A shares								16	(16)
Issuance of stock	244	244	244
Shares issued in connection with acquisition	10,773	10,773	10,768					5
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	(6,019)	(6,019)			(6,019)
Ending balance at Jun. 30, 2019	2,533,764	2,525,625	2,220,348	0	(14,474)	8,139	313,198	4,681	1,872
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	77,239	77,239					77,239
Net loss (income) attributable to noncontrolling interests	157					157
Foreign currency translation adjustment, net of income taxes	(280)	(280)			(280)
Share-based compensation expense	18,023	18,023	18,023
Redeemable equity vested	9,071	9,071	9,071
Change in redeemable equity	(51,450)	(51,450)	(51,450)
Class A shares acquired through share repurchase program and retired	(486,920)	(486,920)	(486,736)					(184)
Conversion of Class B to Class A shares								9	(9)
Issuance of stock	429	429	429
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	(10,766)	(10,766)			(10,766)
Ending balance at Sep. 30, 2019	$ 2,089,267	$ 2,080,971	$ 1,709,685	$ 0	$ (25,520)	$ 8,296	$ 390,437	$ 4,506	$ 1,863