Components of Selected Balance Sheet Accounts (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Other current assets:
Tubular inventory and well materials	$ 2,989		$ 4,061
Prepaid expenses	1,469		1,064
Other current assets	4,458		5,125
Other assets:
Deferred issuance costs of the Credit Facility, net of amortization	3,952		2,437
Operating Lease, Right-of-Use Asset	2,740	$ 2,500	0
Other	32		44
Accounts payable and accrued liabilities:
Trade accounts payable	30,098		16,507
Drilling costs	18,832		22,434
Royalties	44,537		51,212
Production, ad valorem and other taxes	3,244		2,418
Compensation-related	5,272		4,489
Interest	730		670
Operating Lease, Liability, Current	847		0
Other	2,264		5,970
Other liabilities:
Asset retirement obligations	4,934		4,314
Operating Lease, Liability, Noncurrent	2,232		0
Liability, Defined Benefit Pension Plan, Noncurrent	873		857
Postretirement health care benefit obligations	$ 343		$ 362