Income Taxes (Schedule Of Provision For Income Tax Benefit (Expense) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Expense Benefit [Abstract]
Total current benefit (expense)	$ (2,144)	$ (11,689)	$ (65,838)	$ (47,276)
Total deferred benefit	(697)	(12,687)	(15,685)	(44,866)
Income tax benefit (expense)	$ (2,841)	$ (24,376)	$ (81,523)	$ (92,142)