Summary of Provision for Income Taxes from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current income taxes (benefit)
Federal	$ 0	$ 0	$ 1,279
State	0	(26)	(3,933)
Current Income Tax Expense (Benefit), Total	0	(26)	(2,654)
Deferred income tax benefit
Federal	(77,046)	(60,676)	(80,529)
State	(650)	(8,000)	(4,972)
Deferred Income Tax Expense (Benefit), Total	(77,696)	(68,676)	(85,501)
Income tax benefit	$ (77,696)	$ (68,702)	$ (88,155)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.