Long-Term Debt - Schedule of Long-Term Debt Interest Rate (Detail)	12 Months Ended
	Dec. 31, 2017
Oasis Credit Facility | 1st Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.25
Oasis Credit Facility | 2nd Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.25
Oasis Credit Facility | 2nd Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.5
Oasis Credit Facility | 3rd Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.5
Oasis Credit Facility | 3rd Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.75
Oasis Credit Facility | 4th Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.75
Oasis Credit Facility | 4th Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.9
Oasis Credit Facility | 5th Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.9
Oasis Credit Facility | LIBOR | 1st Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.50%
Oasis Credit Facility | LIBOR | 2nd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.75%
Oasis Credit Facility | LIBOR | 3rd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.00%
Oasis Credit Facility | LIBOR | 4th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.25%
Oasis Credit Facility | LIBOR | 5th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.50%
Oasis Credit Facility | ABR | 1st Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	0.00%
Oasis Credit Facility | ABR | 2nd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	0.25%
Oasis Credit Facility | ABR | 3rd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	0.50%
Oasis Credit Facility | ABR | 4th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	0.75%
Oasis Credit Facility | ABR | 5th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.00%
OMP Credit Facility | 1st Range
Debt Instrument [Line Items]
Commitment fee (percent)	0.375%
OMP Credit Facility | 1st Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	3.00
OMP Credit Facility | 2nd Range
Debt Instrument [Line Items]
Commitment fee (percent)	0.375%
OMP Credit Facility | 2nd Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	3.00
OMP Credit Facility | 2nd Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	3.50
OMP Credit Facility | 3rd Range
Debt Instrument [Line Items]
Commitment fee (percent)	0.50%
OMP Credit Facility | 3rd Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	3.50
OMP Credit Facility | 3rd Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	4.00
OMP Credit Facility | 4th Range
Debt Instrument [Line Items]
Commitment fee (percent)	0.50%
OMP Credit Facility | 4th Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	4.00
OMP Credit Facility | 4th Range | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	4.50
OMP Credit Facility | 5th Range
Debt Instrument [Line Items]
Commitment fee (percent)	0.50%
OMP Credit Facility | 5th Range | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	4.50
OMP Credit Facility | Eurodollar [Member] | 1st Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.75%
OMP Credit Facility | Eurodollar [Member] | 2nd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.00%
OMP Credit Facility | Eurodollar [Member] | 3rd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.25%
OMP Credit Facility | Eurodollar [Member] | 4th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.50%
OMP Credit Facility | Eurodollar [Member] | 5th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	2.75%
OMP Credit Facility | ABR | 1st Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	0.75%
OMP Credit Facility | ABR | 2nd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.00%
OMP Credit Facility | ABR | 3rd Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.25%
OMP Credit Facility | ABR | 4th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.50%
OMP Credit Facility | ABR | 5th Range
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)	1.75%