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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Significant Accounting Policies [Line Items]        
Bank overdrafts balance $ 0 $ 0    
Estimated useful lives of investment property depreciated using the straight-line method 20 years      
Unused net operating losses $ 13,756 18,225    
Net deferred tax assets (132) 526 $ 1,601 $ 1,831
Tax benefit amount that would have increased profit and equity if the Company was able to recognize all unrecognized deferred tax assets 3,947 4,846 $ 3,473  
Unused tax losses [Member]        
Disclosure Of Significant Accounting Policies [Line Items]        
Net deferred tax assets $ 197 $ 619    
Bottom of range [Member]        
Disclosure Of Significant Accounting Policies [Line Items]        
Estimated useful lives of investment property depreciated using the straight-line method 20 years      
Top of range [Member]        
Disclosure Of Significant Accounting Policies [Line Items]        
Estimated useful lives of investment property depreciated using the straight-line method 30 years