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Summary of Phantom Stock Activity (Detail) - Phantom Stock Plan - $ / shares	4 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Series A Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding			$ 1.00	$ 1.00
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock		$ 1.00
Weighted-average Grant-Date Fair Value, Vested			$ 1.00	1.00
Weighted-average Grant-Date Fair Value, Cancelled				1.00
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding		1.00		1.00
Weighted-average Grant-Date Fair Value, Cancelled/forfeited		$ 1.00
Weighted-average Grant-Date Fair Value, Cancelled				$ 1.00
Number of Shares Beginning Balance Outstanding			7,650	21,934
Number of Shares, Issuance of Successor phantom stock		22,963
Number of Shares, Vested			7,650	13,009
Number of Shares, Cancelled				(1,275)
Number of Shares Ending Balance Outstanding		21,934		7,650
Number of Shares, Cancelled/forfeited		(1,029)
Number of Shares, Vested			(7,650)	(13,009)
Series B Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding			$ 2.94	$ 0.98
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock		$ 0.98
Weighted-average Grant-Date Fair Value, Vested			$ 2.94	0.98
Weighted-average Grant-Date Fair Value, Cancelled				0.98
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding		0.98		2.94
Weighted-average Grant-Date Fair Value, Cancelled/forfeited		$ 0.98
Weighted-average Grant-Date Fair Value, Cancelled				$ 0.98
Number of Shares Beginning Balance Outstanding			8,269	23,712
Number of Shares, Issuance of Successor phantom stock		24,824
Number of Shares, Vested			8,269	14,064
Number of Shares, Cancelled				(1,379)
Number of Shares Ending Balance Outstanding		23,712		8,269
Number of Shares, Cancelled/forfeited		(1,112)
Number of Shares, Vested			(8,269)	(14,064)
Time Based Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding	$ 9.74	$ 9.77	$ 226.50	$ 308.24
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock		308.19
Weighted-average Grant-Date Fair Value, Vested			$ 226.50	360.14
Weighted-average Grant-Date Fair Value, Cancelled	9.70			240.39
Weighted-average Grant-Date Fair Value, forfeited	10.08
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding	9.77	308.24		226.50
Weighted-average Grant-Date Fair Value, Cancelled/forfeited		$ 307.31
Weighted-average Grant-Date Fair Value, Cancelled	$ 9.70			$ 240.39
Number of Shares Beginning Balance Outstanding	946,150	444,838	4,517	13,526
Number of Shares, Issuance of Successor phantom stock		14,160
Number of Shares, Vested			4,517	8,223
Number of Shares, Cancelled	(484,446)			(786)
Number of Shares, forfeited	(16,866)
Number of Shares Ending Balance Outstanding	444,838	13,526		4,517
Number of Shares, Cancelled/forfeited		(634)
Number of Shares, Vested			(4,517)	(8,223)

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