Discontinued Operations (Additional Information) (Detail) $ in Thousands	3 Months Ended
	Jun. 30, 2016 USD ($) a well	Mar. 31, 2016 USD ($) a well
Discontinued Operations and Disposal Groups [Abstract]
Gain (loss) on disposition of proved property	$ (3,596)	$ (10,977)
Net mineral acres leased from others sold | a	8,100	190,960
Gross producing oil and gas wells sold | well	175	185
Net producing oil and gas wells sold | well	16	66
Proceeds from sale of oil and gas property and equipment	$ 46,986	$ 32,227
Reimbursement of capital costs related to sale of in progress wells		$ 3,269