Components of Selected Balance Sheet Accounts (Detail) - USD ($) $ in Thousands	Sep. 30, 2017		Dec. 31, 2016
Other current assets:
Tubular inventory and well materials	$ 2,297		$ 2,125
Prepaid expenses	818		903
Other Assets, Current	3,115		3,028
Other assets:
Deferred issuance costs of the Revolver	3,130		2,785
Earnest Money Deposits	3,205	[1]	0
Other	2,488		2,544
Other assets	8,823		5,329
Accounts payable and accrued liabilities:
Trade accounts payable	7,275		9,825
Drilling costs	10,620		2,479
Royalties and revenue – related	30,184		26,116
Compensation – related	3,135		2,557
Interest	107		55
Reserve for bankruptcy claims	3,922		3,922
Other	6,993		4,743
Accounts payable and accrued liabilities	62,236		49,697
Other liabilities:
Asset retirement obligations	3,041		2,459
Defined benefit pension obligations	946		1,025
Postretirement health care benefit obligations	544		488
Other	100		100
Other liabilities	$ 4,631		$ 4,072

[1] 1 Represents amount remaining in the escrow deposit for the Acquisition (see Note 3).