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Common Shares - Additional Information (Detail) - USD ($)
Jul. 02, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 12, 2017
May 10, 2005
Class of Stock [Line Items]          
Common stock, shares issued   508,763,020 508,763,020   6,000
Common shares, par value   $ 2.00 $ 2.00   $ 2.00
Treasury shares held by Company   4,244,080 4,244,080    
Outstanding shares in issue   504,518,940 504,518,940 504,518,940  
Dividends payable       $ 0  
Subsequent Event [Member]          
Class of Stock [Line Items]          
Common share issued 100,000,000