Components of Selected Balance Sheet Accounts (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Other current assets:
Tubular inventory and well materials	$ 5,802		$ 2,271
Prepaid expenses	4,215		3,653
Other	97		0
Prepaid Expense and Other Assets, Current, Total	10,114		5,924
Other assets:
Debt issuance costs	26,194		30,239
Assets of supplemental employee retirement plan	4,123	[1]	3,734	[1]
Other	95		562
Other assets	30,412		34,535
Accounts payable and accrued liabilities:
Trade accounts payable	174,496		120,278
Drilling and other lease operating costs	68,842		51,529
Royalties	27,883		39,929
Compensation-related	9,197	[2],[3]	8,584	[2],[3]
Interest	15,555		15,718
Preferred stock dividends	6,067		1,725
Other	10,187		10,241
Accounts payable and accrued liabilities	312,227		248,004
Other liabilities:
Deferred gains on sales of assets	90,569		0
Firm transportation obligation	12,042		13,245
Asset retirement obligations	5,889		6,437
Defined benefit pension obligations	1,753	[3]	1,579	[3]
Postretirement health care benefit obligations	890	[3]	1,023	[3]
Compensation-related	7,631	[4]	5,839	[4]
Deferred compensation - supplemental employee retirement plan obligation and other	4,183	[1]	3,883	[1]
Other	929		1,380
Other liabilities	$ 123,886		$ 33,386

[1] Includes the assets and liabilities of the Penn Virginia Corporation Supplemental Employee Retirement Plan (“SERP”) which is a nonqualified supplemental employee retirement savings plan. Assets of the SERP are held in a Rabbi Trust. Shares of our common stock held by the Rabbi Trust are presented for financial reporting purposes as treasury stock carried at cost.

[2] Includes employer matching obligations under our defined contribution retirement plan of $0.3 million and $0.2 million as of December 31, 2014 and 2013, respectively. The expense recognized with respect to this plan was $1.7 million, $1.0 million and $0.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.

[3] Includes the combined unfunded benefit obligations under our defined benefit pension and postretirement health care plans of $2.8 million and $3.0 million as of December 31, 2014 and 2013. The expense recognized with respect to these plans was $0.1 million, $0.3 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively.

[4] Includes liability-classified share-based compensation awards of $2.9 million representing amounts currently payable in cash in 2015 and $6.4 million and $4.8 million representing estimated amounts payable in cash based on valuations prepared as of December 31, 2014 and 2013, respectively.