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Equity - Authorized Shares and Common Shares Issued and Fully Paid (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 08, 2008
Sep. 07, 2008
Disclosure Of Classes Of Share Capital [Abstract]          
Number of shares 50,000,000 50,000,000   50,000,000 20,000,000
Number of common shares issued and fully paid 13,830,769 13,830,769 13,830,769    
Amount of common shares issued and fully paid $ 138 $ 138 $ 138