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Long-term Prepayments for Lease - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]  
Long-term lease expire date From 2049 to 2074
Bottom of range [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Long-term lease period 40 years
Top of range [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Long-term lease period 70 years