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Equity - Summary of Treasury Shares (Detail) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance 265,883 265,883 145,883
Addition     120,000
Decrease 0 0 0
Ending balance 265,883 265,883 265,883
Shares held by subsidiaries [member]      
Beginning balance 145,883 145,883 145,883
Decrease 0 0 0
Ending balance 145,883 145,883 145,883
Shares reserved for bonds conversion [member]      
Beginning balance 120,000 120,000  
Addition     120,000
Decrease 0 0 0
Ending balance 120,000 120,000 120,000