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Profit Before Income Tax - Summary of Capitalized Borrowing Costs (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories related to real estate business [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest capitalization rates 4.35% 4.35% 4.35%
Inventories related to real estate business [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest capitalization rates 5.39% 6.00% 6.77%
Property, plant and equipment [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest capitalization rates 1.26% 1.15% 0.75%
Property, plant and equipment [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest capitalization rates 5.49% 4.42% 6.15%
Investment properties [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest capitalization rates 1.26%    
Investment properties [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest capitalization rates 1.97%