Income Taxes (Detail) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 03, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 03, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Cancellation of Indebtedness Income	$ 745.7
Operating loss carryforwards							$ 81.3
Deferred tax asset, increase (decrease)	$ (10.6)
Effective tax rate				56.10%
Federal statutory income tax rate				35.00%
Predecessor Company
Income Taxes [Line Items]
Effective tax rate		(33.70%)	56.10%		(34.10%)	(234.60%)