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Real Estate Properties under Development, Net - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Real estate properties under development pledged to banks to obtain loan facilities $ 81,688
Capitalized debt issuance costs 412  
Scheduled minimum rental payments to be received $ 1,836  
Lease expiration date Dec. 31, 2020  
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Capitalized debt issuance costs $ 1,473  
Interest for bank loans $ 707