Income Tax - Schedule of Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Current Income taxes:
Federal, current	$ (52,601)	[1]	$ 77,909	[2]	$ (31,584)	[3]
State, current	(9,477)	[1]	18,400	[2]	762	[3]
Foreign, current	6	[1]	538	[2]	168	[3]
Total current income tax expense (benefit)	(62,072)	[1]	96,847	[2]	(30,654)	[3]
Deferred income taxes:
Federal, deferred	15,051	[1]	(631)	[2]	(416,478)	[3]
State, deferred	4,696	[1]	(8,271)	[2]	(76,423)	[3]
Total deferred income tax expense (benefit)	19,747	[1]	(8,902)	[2]	(492,901)	[3]
Total income tax expense (benefit)	$ (42,325)	[1]	$ 87,945	[2]	$ (523,555)	[3]

[1] Excludes $431.0 million in income tax expense related to discontinued operations.

[2] Excludes $80.4 million in income tax expense related to discontinued operations.

[3] Excludes $67.2 million in income tax expense related to discontinued operations.