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Equity-Based Compensation - Summarizes Information Related to Awards (Detail) - $ / shares	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Nov. 19, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Cancelled (in shares)		(2,147,101)
Weighted Average Grant Date Fair Value per Share
Cancelled (in usd per share)		$ 8.31
Non-vested shares outstanding, ending balance (in dollars per share)	$ 37.35
Restricted stock awards
Shares
Non-vested shares outstanding , beginning balance (in shares)	0	5,736,167
Granted, shares (in shares)	93,000	3,516,579
Vested, shares (in shares)	0	(6,054,387)
Forfeited, shares (in shares)	0	(3,198,359)
Non-vested shares outstanding, ending balance (in shares)	93,000	0	5,736,167
Weighted Average Grant Date Fair Value per Share
Non-vested shares outstanding, beginning balance (in dollars per share)	$ 0	$ 8.77
Granted (in dollars per share)	37.35	3.06	$ 6.61	$ 10.20
Vested (in dollars per share)	0	7.92
Forfeited (in dollars per share)	0	3.20
Non-vested shares outstanding, ending balance (in dollars per share)	$ 0	$ 0	$ 8.77
Performance share unit awards
Shares
Non-vested shares outstanding , beginning balance (in shares)	0	3,027,224
Granted, shares (in shares)		2,429,747
Vested, shares (in shares)		(913,346)
Forfeited, shares (in shares)		(2,396,524)
Non-vested shares outstanding, ending balance (in shares)		0	3,027,224
Weighted Average Grant Date Fair Value per Share
Non-vested shares outstanding, beginning balance (in dollars per share)	$ 0	$ 9.12
Granted (in dollars per share)		2.56	$ 6.80	12.71
Vested (in dollars per share)		8.29
Forfeited (in dollars per share)		3.13
Non-vested shares outstanding, ending balance (in dollars per share)		$ 0	$ 9.12
Phantom units
Shares
Non-vested shares outstanding , beginning balance (in shares)	46,527	362,002
Granted, shares (in shares)	0	242,500
Vested, shares (in shares)	(19,927)	(242,360)
Forfeited, shares (in shares)	0	(315,615)
Non-vested shares outstanding, ending balance (in shares)	26,600	46,527	362,002
Weighted Average Grant Date Fair Value per Share
Non-vested shares outstanding, beginning balance (in dollars per share)	$ 11.77	$ 19.09
Vested (in dollars per share)	12.21	14.01
Forfeited (in dollars per share)	0	8.64
Non-vested shares outstanding, ending balance (in dollars per share)	12.55	11.77	$ 19.09
Phantom units | Long Term Incentive Plan (LTIP)
Weighted Average Grant Date Fair Value per Share
Granted (in dollars per share)	$ 0	$ 8.65	$ 18.57	23.91
Restricted unit awards | OMP LTIP
Shares
Non-vested shares outstanding , beginning balance (in shares)	16,170	16,170
Granted, shares (in shares)	0	16,170
Vested, shares (in shares)	0	(16,170)
Forfeited, shares (in shares)	0	0
Non-vested shares outstanding, ending balance (in shares)	16,170	16,170	16,170
Weighted Average Grant Date Fair Value per Share
Non-vested shares outstanding, beginning balance (in dollars per share)	$ 16.69	$ 18.57
Granted (in dollars per share)	0	16.69	$ 18.57	$ 17.55
Vested (in dollars per share)	0	18.57
Forfeited (in dollars per share)	0	0
Non-vested shares outstanding, ending balance (in dollars per share)	$ 16.69	$ 16.69	$ 18.57

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Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Cancelled

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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