Components of Selected Balance Sheet Accounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017
Other current assets:
Tubular inventory and well materials	$ 5,391		$ 5,146
Prepaid expenses	1,365		1,104
Other Assets, Current	6,756		6,250
Other assets:
Deferred issuance costs of the Revolver	3,268		2,857
Earnest Money Deposits	0	[1]	3,210
Other	5		2,440
Other assets	3,273		8,507
Accounts payable and accrued liabilities:
Trade accounts payable	17,223		22,579
Drilling costs	32,005		22,389
Royalties and revenue – related	34,995		39,287
Compensation – related	1,791		2,975
Interest	366		223
Reserve for bankruptcy claims	3,933		3,933
Other	6,821		4,795
Accounts payable and accrued liabilities	97,134		96,181
Other liabilities:
Asset retirement obligations	3,777		3,286
Defined benefit pension obligations	940		971
Postretirement health care benefit obligations	491		476
Other	100		100
Other liabilities	$ 5,308		$ 4,833

[1] Represents the amount remaining in the Escrow Account for the Devon Acquisition which was utilized to fund the remaining liabilities due to Devon for the final settlement in March 2018 (see Note 3).