Debt - Summary of Weighted-Average Interest Rates Paid on Variable-Rate Debt Obligations (Detail)	4 Months Ended	8 Months Ended	12 Months Ended
	May 04, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Credit Facility [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, weighted-average interest rates			4.76%	4.96%
Emergence Credit Facility [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, weighted-average interest rates		5.08%		5.75%
Predecessor's Revolving Credit Facility [Member] | Predecessor [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, weighted-average interest rates	4.18%