Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Current federal income tax benefit	$ (10,904)	$ 15,022	$ (20,386)
Current income tax receivable	7,366	10,027
Operating loss carryforwards	67,882
Operating loss carryforwards expiration year	2033
Statutory depletion deductions available for tax reporting purposes	1,453
Income taxes allocated to other comprehensive income related to oil and gas hedges	(17,003)	3,918	20,290
Unrecognized tax benefits, interest expense	$ 0	$ 385