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Equity - Summary of Treasury Shares (Detail) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Beginning balance 72,941 265,883 265,883
Addition   1,852 0
Decrease   (194,794) 0
Ending balance   72,941 265,883
Shares held by subsidiaries [member]      
Beginning balance 72,941 145,883 145,883
Addition     0
Decrease   (72,942) 0
Ending balance 72,941 72,941 145,883
Shares reserved for bonds conversion [member]      
Beginning balance   120,000 120,000
Addition     0
Decrease   (120,000) 0
Ending balance     120,000
Equity Shares Held by Controlled Trust [member]      
Addition 0 1,852  
Decrease 0 (1,852)