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Income Taxes (Schedule Of Computation From Income Tax At Federal Rate To Income Tax Benefit (Expense) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Income Tax Rates [Abstract]
Income tax benefit at statutory rates									$ 227,686	$ 246,284	$ 246,867
State income taxes, net of federal tax effects									17,795	26,518	32,768
Foreign income taxes									(23,474)	11,074	(22,640)
Nondeductible items									(5,764)	(5,533)	(4,870)
Changes in valuation allowance and other estimates									(302,935)	(333,641)	(135,161)
Other, net									(265)	(3,191)	4,853
Income tax benefit (expense)	$ (5,434)	$ (2,841)	$ (22,077)	$ (56,605)	$ 33,654	$ (24,376)	$ 621	$ (68,388)	$ (86,957)	$ (58,489)	$ 121,817
Reconciliation of Income Tax Rates Percentages [Abstract]
Income tax benefit at statutory rates									35.00%	35.00%	35.00%
State income taxes, net of federal tax effects									3.00%	4.00%	4.00%
Foreign income taxes									(4.00%)	2.00%	(3.00%)
Nondeductible items									(1.00%)	(1.00%)	(1.00%)
Changes in valuation allowance and other estimates									(46.00%)	(47.00%)	(19.00%)
Other, net									0.00%	(1.00%)	1.00%
Income tax benefit (expense)									(13.00%)	(8.00%)	17.00%

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