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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Dec. 31, 2016
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]          
Revenue $ 338,160 $ 425,940 $ 425,215    
Gross profit 24,787 36,248 39,688    
Operating (loss) /profit (649) 8,684 16,615    
Profit before tax 1,106 11,332 18,668    
Income tax expense (2,057) (3,886) (5,140)    
(Loss) /Profit for the year (951) 7,446 13,528    
Assets          
Contract assets 4,686 1,460   $ 162  
Deferred tax assets 3,939 3,919 3,022 3,026  
Total affected assets 298,911 305,798      
Liabilities          
Other current liabilities 2,356 3,272      
Total affected liabilities 70,476 83,982      
Equity          
Retained earnings 53,384 55,016 53,350 53,257  
Non-controlling interests 74,581 71,788      
Total affected equity 228,435 221,816 $ 222,826   $ 197,175
Total affected liabilities and equity $ 298,911 305,798      
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-process       (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 (loss) /profit   (26)      
Profit before tax   (26)      
Income tax expense   5      
(Loss) /Profit for the year   (21)      
Assets          
Contract assets   (1,460)      
Gross amounts due from customers for contract work-in-process   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 (loss) /profit   8,658      
Profit before tax   11,306      
Income tax expense   (3,881)      
(Loss) /Profit for the year   7,425      
Assets          
Gross amounts due from customers for contract work-in-process   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