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Debt - 1%/12% Step-Up Senior Secured Third Lien Convertible Notes - Additional Information (Detail) - 1%/12% Step-Up Senior Secured Third Lien Convertible Notes - USD ($)
$ / shares in Units, $ in Millions
5 Months Ended 6 Months Ended 12 Months Ended
Dec. 03, 2015
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Debt instrument, maturity date   Dec. 31, 2030    
Debt instrument, payment terms     Interest is computed on the basis of a 360-day year comprised of twelve 30-day months at a rate of 1% per annum for the first four years and then increasing to 12% per annum until maturity.  
Interest rate per annum for the first four years   1.00%    
Interest rate per annum until maturity   12.00%    
Percentage of repurchase of convertible notes   101.00%    
Convertible Notes Payable        
Debt Instrument [Line Items]        
Debt instrument estimated fair value   $ 603.1 $ 603.1  
Ordinary Shares        
Debt Instrument [Line Items]        
Convertible notes   $ 95.60 $ 95.60  
Predecessor        
Debt Instrument [Line Items]        
Stock issued during period, shares, new issues 4,344,959      
Pre-petition secured debt claims $ 2,500.0      
Convertible notes $ 750.0      
Debt instrument, maturity date       Dec. 31, 2030
Debt instrument, payment terms       Interest is computed on the basis of a 360-day year comprised of twelve 30-day months at a rate of 1% per annum for the first four years and then increasing to 12% per annum until maturity.
Interest rate per annum for the first four years       1.00%
Interest rate per annum until maturity       12.00%
Minimum affirmative vote percentage 75.00%      
Predecessor | Ordinary Shares        
Debt Instrument [Line Items]        
Convertible notes $ 95.60