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Earnings (Loss) per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Dec. 17, 2018
Sep. 30, 2018
Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Ordinary shares issued upon mandatory conversion of preferred shares 70.6    
Convertible Preferred Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average shares with anti-dilutive effect on earnings per share   66.0 68.0