Acquisition - Additional Information (Detail) $ / shares in Units, $ in Thousands			3 Months Ended								10 Months Ended	12 Months Ended
	Feb. 28, 2019 USD ($) $ / shares shares	Jan. 18, 2018 USD ($) a Well shares	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Common stock, par value | $ / shares			$ 0.01				$ 0.01				$ 0.01	$ 0.01	$ 0.01	$ 0.01
Revenue			$ 174,109	$ 163,295	$ 155,540	$ 141,497	$ 171,208	$ 130,123	$ 103,622	$ 110,192		$ 634,441	$ 515,145	$ 383,659
Net income from continuing operations			14,034	5,521	24,807	(13,916)						30,446	$ 18,826	$ 8,525
Net income from discontinued operations			$ 30	$ (1,237)	$ 2,705	$ (182)						1,316
Flat Castle Acquisition [Member]
Business Acquisition [Line Items]
Area of land purchased | a		44,500
Purchase price		$ 90,000
Purchase price paid through shares of common stock | shares		2,500,000
Transaction costs capitalized related to acquisition		$ 1,000
Flat Castle Acquisition [Member] | Proved Oil And Gas Properties [Member]
Business Acquisition [Line Items]
Number of producing wells acquired | Well		1
Purchase price		$ 4,000
Flat Castle Acquisition [Member] | Unproved Oil and Natural Gas Properties [Member]
Business Acquisition [Line Items]
Purchase price		$ 86,000
Cardinal Midstream II, LLC [Member]
Business Acquisition [Line Items]
Third party options exercised month and year													2018-07
BRMR and Everest Merger Sub Inc. [Member]
Business Acquisition [Line Items]
Purchase price	$ 275,759
Common stock, par value | $ / shares	$ 0.01
Net income from continuing operations											$ 14,000
Net income from discontinued operations											1,300
BRMR and Everest Merger Sub Inc. [Member] | Continuing Operations [Member]
Business Acquisition [Line Items]
Revenue											131,700
BRMR and Everest Merger Sub Inc. [Member] | Discontinued Operations [Member]
Business Acquisition [Line Items]
Revenue											$ 7,200
BRMR and Everest Merger Sub Inc. [Member] | General And Administrative Expense [Member]
Business Acquisition [Line Items]
Acquisition costs												$ 25,500	$ 4,000
BRMR and Everest Merger Sub Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Purchase price paid through shares of common stock | shares	0.29506
Reverse stock split, description	15-to-1											15-to-1