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Acquisitions and Dispositions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) a	Dec. 31, 2017 USD ($) a	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 65,000	$ 308,000
Capital expenditures, including exploration expense	47,073,000	59,361,000
Proceeds from sale of property and equipment	$ 3,233,000	46,231,000
West Texas and Oklahoma [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment		46,000,000
Martin County [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment		$ 37,400,000
Number of net acres sold or farmed-out leasehold rights | a		2,096
OKLAHOMA | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment		$ 8,600,000
Number of net acres sold or farmed-out leasehold rights | a		1,554
Upton County, Texas [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Number of net acres acquired | a		118
Capital expenditures, including exploration expense		$ 596,600
Reagan County, Texas [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Number of net acres acquired | a	(464)
Number of gross mineral acres acquired | a	1,640
Capital expenditures, including exploration expense	$ 6,080,000
Number of oil wells with working interest ownership	51
Reagan County, Texas [Member] | Mineral Acreage [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of working interest ownership	16.60%
Reagan County, Texas [Member] | Mineral Acreage [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of working interest ownership	33.40%
Texas, Oklahoma, Kansas, Colorado and Wyoming [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment	$ 3,100,000
Partnership And Trust [Member]
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 65,000	$ 308,000	$ 308,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 810
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