Components of Selected Balance Sheet Accounts (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Other current assets:
Tubular inventory and well materials		$ 2,125	$ 2,878
Prepaid expenses		903	4,184
Other		0	42
Other current assets		3,028	7,104
Other assets:
Deferred issuance costs of the credit facilities 1	[1]	2,785	1,572
Assets of supplemental employee retirement plan	[2]	0	4,123
Other		2,544	2,655
Accounts payable and accrued liabilities:
Trade accounts payable		9,825	11,603
Drilling costs		2,479	12,074
Royalties and revenue - related		26,116	39,119
Compensation-related		2,557	9,904
Interest		55	15,531
Sale Leaseback Transaction, Deferred Gain, Current		0	2,593
Restructuring Reserve, Current		0	2,756
Bankruptcy Claims, amount reserved for outstanding claims		3,922	0
Other		4,743	9,945
Other liabilities:
Deferred gains on sales of assets		0	82,943
Firm transportation obligation		0	10,705
Asset retirement obligations		2,459	2,621
Defined benefit pension obligations		1,025	1,129
Postretirement health care benefit obligations		488	731
Compensation-related		0	1,447
Deferred compensation - supplemental employee retirement plan obligation and other		0	4,434
Other		$ 100	$ 928

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[2] .