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Summary of Significant Accounting Policies - Additional Information 1 (Detail)		3 Months Ended		6 Months Ended
	Apr. 27, 2018 USD ($)	Jun. 30, 2018 USD ($) a	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) a $ / bbl $ / Mcf	Jun. 30, 2017 USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items]
Loss on sale of oil and gas properties		$ 6,838,000		$ 35,438,000
Loss resulting from final settlement for property sale		2,700,000		2,700,000
Impairment of oil and gas properties		0	$ 0	0	$ 0
Cash flow hedges derivative instruments		$ 0		$ 0
South Texas Sold Properties
Operations And Summary Of Significant Accounting Policies [Line Items]
Gross proceeds from sale of oil and gas properties	$ 125,000,000
Effective date of sale	Nov. 01, 2017
South Texas Asset Held for Sale
Operations And Summary Of Significant Accounting Policies [Line Items]
Undeveloped Acres | a		8,400		8,400
Assets held for sale, fair value		$ 55,000,000		$ 55,000,000
Loss on sale of oil and gas properties		$ 4,100,000		$ 32,700,000
Management's oil price outlook | $ / bbl				72.03
Management's gas price outlook | $ / Mcf				4.31
Annual minimum discount rate				20.00%
Annual maximum discount rate				25.00%

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