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Share Contribution and Exchange Agreement - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Jan. 05, 2018
Jun. 30, 2018
Mar. 04, 2018
May 31, 2017
Schedule of Capitalization, Equity [Line Items]        
Common stock, par value $ 0.0277   $ 0.0277 $ 0.0277
Ownership percentage 15.50%      
Common stock, shares authorized     15,000,000 15,000,000
Termination fee payable under specified circumstances $ 10      
Termination fee payable upon entering into or closing acquisition transaction 3      
Additional termination fee payable 7      
Reimbursement fees and expenses payable $ 2      
Scenario Forecast [Member]        
Schedule of Capitalization, Equity [Line Items]        
Common stock, shares authorized   115,000,000    
Champion Enterprises Holdings, LLC [Member]        
Schedule of Capitalization, Equity [Line Items]        
Ownership percentage 84.50%