Income Taxes (Schedule Of Provision For Income Tax Benefit (Expense) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Expense Benefit [Abstract]
Current tax expense	$ (10,749)	$ (40,385)
Deferred tax benefit (expense)	1,256	(16,220)
Income tax expense	$ (9,493)	$ (56,605)