GUARANTOR SUBSIDIARIES - Schedule Of Guarantor Subsidiaries, Cash Flow (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Consolidated net income (loss)	$ (246,184)	$ (28,530)	$ (801,781)	$ (363,447)
Reconciling items:
Impairment charges	7,631	8,000	7,631	8,000
Depreciation and amortization	149,749	158,453	443,650	476,053
Deferred taxes	9,400	(3,726)	12,505	(14,097)
Provision for doubtful accounts			20,936	20,042
Amortization of deferred financing charges and note discounts, net			42,682	51,806
Share-based compensation	3,539	3,484	9,020	10,350
(Gain) loss on disposal of operating assets			(30,149)	(227,765)
Loss on investments, net	2,173	13,767	2,433	13,767
Equity in (earnings) loss of nonconsolidated affiliates	2,238	(1,117)	2,240	926
(Gain) loss on extinguishment of debt	0	(157,556)	0	(157,556)
Barter and trade income			(32,953)	(22,126)
Foreign exchange transaction (gain) loss			(21,602)	46,533
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
(Increase) decrease in accounts receivable			(60,984)	16,909
(Increase) decrease in prepaids and other current assets			(41,306)	(17,836)
Increase (decrease) in accrued expenses			(37,819)	(60,515)
Increase (decrease) in accounts payable			9,419	(39,660)
Increase (decrease) in accrued interest			(78,087)	(92,947)
Increase (decrease) in deferred income			3,847	37,550
Changes in other operating assets and liabilities			(8,399)	41,435
Net cash provided by (used for) operating activities			(558,717)	(272,578)
Cash flows from investing activities:
Purchases of other investments			(29,498)	(33,911)
Proceeds from sale of other investments			5,059	3,256
Purchases of property, plant and equipment	(48,324)	(77,333)	(184,944)	(201,038)
Proceeds from disposal of assets			71,320	604,044
Purchases of other operating assets			(3,224)	(3,464)
Dividends from subsidiaries			0	0
Change in other, net			(3,693)	(2,575)
Net cash provided by (used for) investing activities			(144,980)	366,312
Cash flows from financing activities:
Draws on credit facilities			60,000	0
Payments on credit facilities			(25,909)	(1,728)
Intercompany funding			0	0
Proceeds from long-term debt			156,000	800
Payments on long-term debt			(5,385)	(226,640)
Payments to repurchase noncontrolling interests			(953)	0
Dividends and other payments to noncontrolling interests			(41,083)	(93,371)
Change in other, net			(5,604)	(1,644)
Net cash provided by (used for) financing activities			137,066	(322,583)
Effect of exchange rate changes on cash			7,971	(919)
Net decrease in cash and cash equivalents			(558,660)	(229,768)
Cash and cash equivalents at beginning of period			845,030	772,678
Cash and cash equivalents at end of period	286,370	542,910	286,370	542,910
Eliminations
Cash flows from operating activities:
Consolidated net income (loss)	115,115	288,193	(274,219)	580,130
Reconciling items:
Impairment charges	0	0	0	0
Depreciation and amortization	0	0	0	0
Deferred taxes			0	0
Provision for doubtful accounts			0	0
Amortization of deferred financing charges and note discounts, net			91,454	44,211
Share-based compensation			0	0
(Gain) loss on disposal of operating assets			0	0
Loss on investments, net	(16,372)	0	19,571	(333,405)
Equity in (earnings) loss of nonconsolidated affiliates	(148,365)	(154,543)	(23,676)	(451,233)
(Gain) loss on extinguishment of debt		(160,848)		(160,848)
Barter and trade income			0	0
Foreign exchange transaction (gain) loss			0	0
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
(Increase) decrease in accounts receivable			0	0
(Increase) decrease in prepaids and other current assets			(6,026)	(129,921)
Increase (decrease) in accrued expenses			0	0
Increase (decrease) in accounts payable			0	0
Increase (decrease) in accrued interest			20,797	362
Increase (decrease) in deferred income			0	0
Changes in other operating assets and liabilities			0	0
Net cash provided by (used for) operating activities			(172,099)	(450,704)
Cash flows from investing activities:
Purchases of other investments			0	222,124
Proceeds from sale of other investments			0	0
Purchases of property, plant and equipment			0	0
Proceeds from disposal of assets			0	0
Purchases of other operating assets			0	0
Dividends from subsidiaries			(323)	(261)
Change in other, net			0	0
Net cash provided by (used for) investing activities			(323)	221,863
Cash flows from financing activities:
Draws on credit facilities			0
Payments on credit facilities			0	0
Intercompany funding			0	0
Proceeds from long-term debt			0	0
Payments on long-term debt			0	(222,124)
Payments to repurchase noncontrolling interests			0
Dividends and other payments to noncontrolling interests			172,422	450,965
Change in other, net			0	0
Net cash provided by (used for) financing activities			172,422	228,841
Effect of exchange rate changes on cash			0	0
Net decrease in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
Parent Company
Cash flows from operating activities:
Consolidated net income (loss)	(214,927)	(168,651)	(512,534)	(531,294)
Reconciling items:
Impairment charges	0	0	0	0
Depreciation and amortization	0	0	0	0
Deferred taxes			0	0
Provision for doubtful accounts			0	0
Amortization of deferred financing charges and note discounts, net			0	0
Share-based compensation			0	0
(Gain) loss on disposal of operating assets			0	0
Loss on investments, net	0	0	0	0
Equity in (earnings) loss of nonconsolidated affiliates	214,927	168,651	512,534	531,294
(Gain) loss on extinguishment of debt		0		0
Barter and trade income			0	0
Foreign exchange transaction (gain) loss			0	0
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
(Increase) decrease in accounts receivable			0
(Increase) decrease in prepaids and other current assets			0	0
Increase (decrease) in accrued expenses			0	0
Increase (decrease) in accounts payable			0	0
Increase (decrease) in accrued interest			0	0
Increase (decrease) in deferred income			0	0
Changes in other operating assets and liabilities			0	0
Net cash provided by (used for) operating activities			0	0
Cash flows from investing activities:
Purchases of other investments			0	0
Proceeds from sale of other investments			0	0
Purchases of property, plant and equipment			0	0
Proceeds from disposal of assets			0	0
Purchases of other operating assets			0	0
Dividends from subsidiaries			323	165
Change in other, net			0	0
Net cash provided by (used for) investing activities			323	165
Cash flows from financing activities:
Draws on credit facilities			0
Payments on credit facilities			0	0
Intercompany funding			0	0
Proceeds from long-term debt			0	0
Payments on long-term debt			0	0
Payments to repurchase noncontrolling interests			0
Dividends and other payments to noncontrolling interests			0	0
Change in other, net			(323)	(165)
Net cash provided by (used for) financing activities			(323)	(165)
Effect of exchange rate changes on cash			0	0
Net decrease in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
Subsidiary Issuer
Cash flows from operating activities:
Consolidated net income (loss)	(214,927)	(168,651)	(512,534)	(531,294)
Reconciling items:
Impairment charges	0	0	0	0
Depreciation and amortization	0	0	0	0
Deferred taxes			109,527	59,920
Provision for doubtful accounts			0	0
Amortization of deferred financing charges and note discounts, net			32,841	45,802
Share-based compensation			0	0
(Gain) loss on disposal of operating assets			0	0
Loss on investments, net	0	0	0	0
Equity in (earnings) loss of nonconsolidated affiliates	(124,594)	(30,201)	(560,560)	(292,057)
(Gain) loss on extinguishment of debt		3,207		3,207
Barter and trade income			0	0
Foreign exchange transaction (gain) loss			0	0
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
(Increase) decrease in accounts receivable			0
(Increase) decrease in prepaids and other current assets			2,904	(2,118)
Increase (decrease) in accrued expenses			43,109	19,055
Increase (decrease) in accounts payable			0	0
Increase (decrease) in accrued interest			(107,090)	(98,413)
Increase (decrease) in deferred income			0	0
Changes in other operating assets and liabilities			0	0
Net cash provided by (used for) operating activities			(991,803)	(795,898)
Cash flows from investing activities:
Purchases of other investments			0	0
Proceeds from sale of other investments			0	0
Purchases of property, plant and equipment			0	0
Proceeds from disposal of assets			0	0
Purchases of other operating assets			0	0
Dividends from subsidiaries			0	0
Change in other, net			0	0
Net cash provided by (used for) investing activities			0	0
Cash flows from financing activities:
Draws on credit facilities			60,000
Payments on credit facilities			(25,000)	0
Intercompany funding			957,124	796,061
Proceeds from long-term debt			0	0
Payments on long-term debt			0	0
Payments to repurchase noncontrolling interests			0
Dividends and other payments to noncontrolling interests			(323)	(165)
Change in other, net			0	0
Net cash provided by (used for) financing activities			991,801	795,896
Effect of exchange rate changes on cash			0	0
Net decrease in cash and cash equivalents			(2)	(2)
Cash and cash equivalents at beginning of period			3	6
Cash and cash equivalents at end of period	1	4	1	4
Guarantor Subsidiaries
Cash flows from operating activities:
Consolidated net income (loss)	120,350	29,343	558,335	314,845
Reconciling items:
Impairment charges	6,040	726	6,040	726
Depreciation and amortization	68,386	72,412	205,983	217,084
Deferred taxes			(75,393)	(104,327)
Provision for doubtful accounts			14,554	11,483
Amortization of deferred financing charges and note discounts, net			(37,278)	(29,908)
Share-based compensation			1,867	2,159
(Gain) loss on disposal of operating assets			145	3,949
Loss on investments, net	0	14,548	(12,946)	14,548
Equity in (earnings) loss of nonconsolidated affiliates	58,083	14,249	71,832	211,548
(Gain) loss on extinguishment of debt		85		85
Barter and trade income			(27,206)	(21,876)
Foreign exchange transaction (gain) loss			470	103
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
(Increase) decrease in accounts receivable			(43,205)	(32,122)
(Increase) decrease in prepaids and other current assets			(28,724)	157,890
Increase (decrease) in accrued expenses			(70,198)	(33,501)
Increase (decrease) in accounts payable			13,438	(12,872)
Increase (decrease) in accrued interest			2,175	47
Increase (decrease) in deferred income			(14,491)	28,855
Changes in other operating assets and liabilities			(11,914)	15,542
Net cash provided by (used for) operating activities			553,484	744,258
Cash flows from investing activities:
Purchases of other investments			(5,336)	(5,000)
Proceeds from sale of other investments			0	2,475
Purchases of property, plant and equipment			(49,833)	(52,941)
Proceeds from disposal of assets			286	12,309
Purchases of other operating assets			(240)	(1,775)
Dividends from subsidiaries			0	96
Change in other, net			(7)	(358)
Net cash provided by (used for) investing activities			(55,130)	(45,194)
Cash flows from financing activities:
Draws on credit facilities			0
Payments on credit facilities			0	0
Intercompany funding			(715,690)	(925,171)
Proceeds from long-term debt			0	0
Payments on long-term debt			(4,781)	(2,540)
Payments to repurchase noncontrolling interests			0
Dividends and other payments to noncontrolling interests			0	3
Change in other, net			0	0
Net cash provided by (used for) financing activities			(720,471)	(927,708)
Effect of exchange rate changes on cash			0	0
Net decrease in cash and cash equivalents			(222,117)	(228,644)
Cash and cash equivalents at beginning of period			277,210	347,863
Cash and cash equivalents at end of period	55,093	119,219	55,093	119,219
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Consolidated net income (loss)	(51,795)	(8,764)	(60,829)	(195,834)
Reconciling items:
Impairment charges	1,591	7,274	1,591	7,274
Depreciation and amortization	81,363	86,041	237,667	258,969
Deferred taxes			(21,629)	30,310
Provision for doubtful accounts			6,382	8,559
Amortization of deferred financing charges and note discounts, net			(44,335)	(8,299)
Share-based compensation			7,153	8,191
(Gain) loss on disposal of operating assets			(30,294)	(231,714)
Loss on investments, net	18,545	(781)	(4,192)	332,624
Equity in (earnings) loss of nonconsolidated affiliates	2,187	727	2,110	1,374
(Gain) loss on extinguishment of debt		0		0
Barter and trade income			(5,747)	(250)
Foreign exchange transaction (gain) loss			(22,072)	46,430
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
(Increase) decrease in accounts receivable			(17,779)	49,031
(Increase) decrease in prepaids and other current assets			(9,460)	(43,687)
Increase (decrease) in accrued expenses			(10,730)	(46,069)
Increase (decrease) in accounts payable			(4,019)	(26,788)
Increase (decrease) in accrued interest			6,031	5,057
Increase (decrease) in deferred income			18,338	8,695
Changes in other operating assets and liabilities			3,515	25,893
Net cash provided by (used for) operating activities			51,701	229,766
Cash flows from investing activities:
Purchases of other investments			(24,162)	(251,035)
Proceeds from sale of other investments			5,059	781
Purchases of property, plant and equipment			(135,111)	(148,097)
Proceeds from disposal of assets			71,034	591,735
Purchases of other operating assets			(2,984)	(1,689)
Dividends from subsidiaries			0	0
Change in other, net			(3,686)	(2,217)
Net cash provided by (used for) investing activities			(89,850)	189,478
Cash flows from financing activities:
Draws on credit facilities			0
Payments on credit facilities			(909)	(1,728)
Intercompany funding			(241,434)	129,110
Proceeds from long-term debt			156,000	800
Payments on long-term debt			(604)	(1,976)
Payments to repurchase noncontrolling interests			(953)
Dividends and other payments to noncontrolling interests			(213,182)	(544,174)
Change in other, net			(5,281)	(1,479)
Net cash provided by (used for) financing activities			(306,363)	(419,447)
Effect of exchange rate changes on cash			7,971	(919)
Net decrease in cash and cash equivalents			(336,541)	(1,122)
Cash and cash equivalents at beginning of period			567,817	424,809
Cash and cash equivalents at end of period	$ 231,276	$ 423,687	$ 231,276	$ 423,687