CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 1,590,368	$ 1,614,472	$ 2,919,690	$ 2,976,270
Operating expenses:
Direct operating expenses (excludes depreciation and amortization)	614,377	613,186	1,185,639	1,179,850
Selling, general and administrative expenses (excludes depreciation and amortization)	447,290	434,581	897,909	860,149
Corporate expenses (excludes depreciation and amortization)	77,158	87,657	155,520	165,516
Depreciation and amortization	147,795	162,144	293,901	317,600
Other operating income (expense), net	6,916	(64,190)	38,000	220,273
Operating income (loss)	310,664	252,714	424,721	673,428
Interest expense	463,160	465,991	918,497	929,941
Equity in earnings (loss) of nonconsolidated affiliates	240	(1,610)	(2)	(2,043)
Other income (expense), net	1,647	(34,019)	(13,727)	(39,731)
Income (loss) before income taxes	(150,609)	(248,906)	(507,505)	(298,287)
Income tax expense	(17,408)	(27,137)	(48,092)	(36,630)
Consolidated net income (loss)	(168,017)	(276,043)	(555,597)	(334,917)
Less amount attributable to noncontrolling interest	6,020	2,857	6,655	32,479
Net income (loss) attributable to the Company	(174,037)	(278,900)	(562,252)	(367,396)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	21,927	8,864	31,655	36,441
Unrealized holding gain (loss) on marketable securities	159	(309)	102	(345)
Reclassification adjustments	0	32,824	(1,644)	32,824
Other adjustments to comprehensive income (loss)	0	(3,745)	0	(3,745)
Other comprehensive income	22,086	37,634	30,113	65,175
Comprehensive income (loss)	(151,951)	(241,266)	(532,139)	(302,221)
Less amount attributable to noncontrolling interest	7,516	249	6,053	5,130
Comprehensive income (loss) attributable to the Company	$ (159,467)	$ (241,515)	$ (538,192)	$ (307,351)