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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Aug. 13, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]          
Federal statutory rate 21.00%   21.00%    
Operating losses carryforward indefinitely with no carryback as percentage of taxable income     80.00%    
Interest expense threshold percentage of adjusted taxable income beyond which interest expense is deductible     30.00%    
Deferred federal tax, Remeasurement Rate     21.00%    
Deferred federal tax, Remeasurement Value     $ 140.4    
Refundable unused AMT credit carryforward, Percentage     50.00%    
Refundable unused alternative minimum tax credit carryforward years     2018 through 2020    
Unused AMT credit carryforwards $ 20.4   $ 20.4    
Net operating loss limitation     $ 3.3    
Period of increase in net operating loss limitation     5 years    
Net operating loss expiration period     20 years    
U.S. Federal [Member]          
Income Taxes [Line Items]          
Estimated NOL carryforwards to expire unused 843.0   $ 843.0    
State Taxes [Member]          
Income Taxes [Line Items]          
Estimated NOL carryforwards to expire unused $ 1,300.0   $ 1,300.0    
Predecessor          
Income Taxes [Line Items]          
Federal statutory rate   21.00%   35.00% 35.00%