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(Loss) Earnings Per Share - Computation of Basic and Diluted Earnings Attributable to Common Shareholders Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net (loss) profit attributable to APWC from continuing operations $ (552) $ (1,632) $ 2,928
Net (loss) profit attributable to APWC $ (552) $ (1,632) $ 2,928
Denominator:      
Weighted-average common shares outstanding - basic and diluted 13,819,669 13,819,669 13,819,669
(Loss) earnings per share – basic and diluted      
Continuing operations $ (0.04) $ (0.12) $ 0.21
Total (loss) earnings per share – basic and diluted $ (0.04) $ (0.12) $ 0.21