Commitments and Contingencies - Additional Information (Detail) $ in Thousands	1 Months Ended	2 Months Ended	4 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
	Jan. 31, 2019 USD ($)	Sep. 12, 2016 USD ($)	Dec. 31, 2016 USD ($)	Sep. 12, 2016 USD ($)	Sep. 30, 2018	Dec. 31, 2018 USD ($) bbl	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Reorganization items, Settlements related to contract amendments				$ 2,550		$ 0
Long-term Purchase Commitment, Minimum Volume Required | bbl						8,000
Estimated Litigation Liability, Current						$ 1,300
Crude Oil Gathering Agreement						10
Asset retirement obligations		$ 2,700	$ 2,459	2,700		$ 4,314	$ 3,286
Environmental Compliance
Commitments and Contingencies Disclosure [Line Items]
Asset retirement obligations						4,300
Legal Reserve
Commitments and Contingencies Disclosure [Line Items]
Reserve established for contingency matters							100
Gathering and Intermediate Transportation [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual Commitments Future Minimum Payments Due						114,300
Contractual Commitments Future Minimum Payments Due Current						$ 11,702
Crude Oil Gathering And Transportation Services [Member]
Commitments and Contingencies Disclosure [Line Items]
Reorganization items, Settlements related to contract amendments		$ 300
Original Volume Required [Domain]
Commitments and Contingencies Disclosure [Line Items]
Long-term Purchase Commitment, Minimum Volume Required | bbl						15,000
Term in Years [Domain]
Commitments and Contingencies Disclosure [Line Items]
Crude Oil Gathering Agreement						15
Marketing Agreement					10 years
Successor [Member]
Commitments and Contingencies Disclosure [Line Items]
Operating lease rental expense			$ 200			$ 2,700	$ 1,000
Predecessor [Member]
Commitments and Contingencies Disclosure [Line Items]
Operating lease rental expense				$ 2,400
Subsequent Event [Member]
Commitments and Contingencies Disclosure [Line Items]
Litigation Settlement, Expense	$ 1,000