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Discontinued Operation - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Oct. 02, 2017
USD ($)
Oct. 02, 2017
AUD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
AUD ($)
shares
Dec. 31, 2016
USD ($)
 [1]
Dec. 31, 2015
USD ($)
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items]            
Upfront cash consideration received     $ 5.4   $ 0.0 $ 0.0 [1]
Percentage of shares held           30.00%
Darlot [Member]            
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items]            
Consideration from disposal       $ 18.5    
Cash consideration from disposal       $ 12.0    
Number of shares received from disposal | shares     130,000,000 130,000,000    
Upfront cash consideration received       $ 7.0    
Cash consideration receivable       $ 5.0    
Profit on the sale assets $ 23.5 $ 30.8        
Percentage of shares held 19.90% 19.90%        
Darlot [Member] | Red 5 Limited [Member]            
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items]            
Shares received under underwriting agreement related to disposal of discontinued operation | shares       116,875,821    
Consideration received under underwriting agreement related to disposal of discontinued operation       $ 5.8    
[1] The restatement is as a result of the discontinued operations.