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New Standards And Interpretations - Summary of Application of New Standard Affected Items in Financial Statement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Dec. 31, 2015
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]          
Revenue $ 425,940 $ 425,215 $ 384,565    
Gross profit 36,248 39,688 31,608    
Operating profit 8,684 16,615 7,338    
Profit before tax 11,332 18,668 6,535    
Income tax expense (3,886) (5,140) (510)    
Profit for the year 7,446 13,528 6,025    
Assets          
Contract assets 1,460     $ 162  
Gross amounts due from customers for contract work-in-progress   162      
Deferred tax assets 3,919 3,022   3,026  
Total affected assets 305,798 334,843      
Liabilities          
Other current liabilities 3,272 2,642      
Total affected liabilities 83,982 112,017      
Equity          
Retained earnings 55,016 53,350   53,257  
Non-controlling interests 71,788 69,498      
Total affected equity 221,816 222,826 $ 197,175   $ 193,275
Total affected liabilities and equity 305,798 $ 334,843      
IFRS 15 [Member]          
Assets          
Contract assets 1,460        
Deferred tax assets 3,919        
Total affected assets 5,379        
Liabilities          
Other current liabilities 3,272        
Total affected liabilities 3,272        
Equity          
Retained earnings 55,016        
Foreign currency translation reserve (15,251)        
Non-controlling interests 71,788        
Total affected equity 111,553        
Total affected liabilities and equity 114,825        
Increase (decrease) due to application of IFRS 15 [member]          
Assets          
Contract assets       162  
Gross amounts due from customers for contract work-in-progress       (162)  
Equity          
Retained earnings       $ (113)  
Increase (decrease) due to application of IFRS 15 [member] | IFRS 15 [Member]          
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]          
Revenue (26)        
Gross profit (26)        
Operating profit (26)        
Profit before tax (26)        
Income tax expense 5        
Profit for the year (21)        
Assets          
Contract assets (1,460)        
Gross amounts due from customers for contract work-in-progress 1,460        
Deferred tax assets (18)        
Total affected assets (18)        
Liabilities          
Other current liabilities (88)        
Total affected liabilities (88)        
Equity          
Retained earnings 34        
Foreign currency translation reserve 1        
Non-controlling interests 35        
Total affected equity 70        
Total affected liabilities and equity (18)        
Amounts without adoption of IFRS 15 [Member] | IFRS 15 [Member]          
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]          
Revenue 425,914        
Gross profit 36,222        
Operating profit 8,658        
Profit before tax 11,306        
Income tax expense (3,881)        
Profit for the year 7,425        
Assets          
Gross amounts due from customers for contract work-in-progress 1,460        
Deferred tax assets 3,901        
Total affected assets 5,361        
Liabilities          
Other current liabilities 3,184        
Total affected liabilities 3,184        
Equity          
Retained earnings 55,050        
Foreign currency translation reserve (15,250)        
Non-controlling interests 71,823        
Total affected equity 111,623        
Total affected liabilities and equity $ 114,807