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Debt - Senior Notes - Additional Information (Detail) - USD ($)
$ in Millions
4 Months Ended 12 Months Ended
May 04, 2017
May 04, 2017
Dec. 31, 2019
Jul. 17, 2014
Oct. 10, 2013
May 23, 2013
Apr. 17, 2013
Noteholder Plan Support Agreement [Member]              
Debt Instrument [Line Items]              
Unsecured noteholders to receive pro rata share of cash distribution $ 24.6            
Predecessor [Member] | Noteholder Plan Support Agreement [Member]              
Debt Instrument [Line Items]              
Unsecured noteholders to receive pro rata share of cash distribution $ 24.6            
Senior Notes [Member] | Predecessor [Member]              
Debt Instrument [Line Items]              
Unrecorded contractual interest   $ 24.2          
2021 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes     7.625%        
Maturity date     May 01, 2021        
2021 Senior Notes [Member] | Private Placement of Debt [Member]              
Debt Instrument [Line Items]              
Face amount of senior notes at time of issuance         $ 300.0 $ 100.0 $ 300.0
2022 Senior Notes [Member]              
Debt Instrument [Line Items]              
Maturity date     Aug. 01, 2022        
2022 Senior Notes [Member] | Private Placement of Debt [Member]              
Debt Instrument [Line Items]              
Face amount of senior notes at time of issuance       $ 500.0      
Senior notes       6.875%      
Senior notes issued at par       98.485%