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SEGMENT INFORMATION - Reconciliation of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Operating Segments [Line Items]      
Segment operating assets $ 366,664 $ 371,019  
Investment in associates 810 805  
Deferred tax assets 7,799 7,143  
Total assets 366,664 371,019  
Segment operating liabilities 152,043 159,591  
Deferred tax liabilities 3,840 4,197  
Total liabilities 152,043 159,591  
Revenue 425,772 433,893 $ 476,659
At a point in time      
Disclosure Of Operating Segments [Line Items]      
Revenue 395,818 407,410 451,567
Over time      
Disclosure Of Operating Segments [Line Items]      
Revenue 29,954 26,483 25,092
SDI      
Disclosure Of Operating Segments [Line Items]      
Revenue 57,695 45,931  
Power      
Disclosure Of Operating Segments [Line Items]      
Revenue 221,074 182,171 191,520
Enamel      
Disclosure Of Operating Segments [Line Items]      
Revenue 137,441 178,124 212,776
Others      
Disclosure Of Operating Segments [Line Items]      
Revenue 9,562 27,667 32,887
Fabrication      
Disclosure Of Operating Segments [Line Items]      
Revenue     39,476
North Asia      
Disclosure Of Operating Segments [Line Items]      
Revenue 58,649 77,329 107,032
North Asia | At a point in time      
Disclosure Of Operating Segments [Line Items]      
Revenue 55,982 77,287 107,032
North Asia | Over time      
Disclosure Of Operating Segments [Line Items]      
Revenue 2,667 42 0
North Asia | SDI      
Disclosure Of Operating Segments [Line Items]      
Revenue 2,667 1,209  
North Asia | Power      
Disclosure Of Operating Segments [Line Items]      
Revenue 9 92 0
North Asia | Enamel      
Disclosure Of Operating Segments [Line Items]      
Revenue 55,959 76,002 107,027
North Asia | Others      
Disclosure Of Operating Segments [Line Items]      
Revenue 14 26 5
North Asia | Fabrication      
Disclosure Of Operating Segments [Line Items]      
Revenue     0
Thailand      
Disclosure Of Operating Segments [Line Items]      
Revenue 166,925 171,841 197,779
Thailand | At a point in time      
Disclosure Of Operating Segments [Line Items]      
Revenue 166,832 171,613 197,544
Thailand | Over time      
Disclosure Of Operating Segments [Line Items]      
Revenue 93 228 235
Thailand | SDI      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0  
Thailand | Power      
Disclosure Of Operating Segments [Line Items]      
Revenue 80,564 46,340 63,629
Thailand | Enamel      
Disclosure Of Operating Segments [Line Items]      
Revenue 79,510 102,122 105,749
Thailand | Others      
Disclosure Of Operating Segments [Line Items]      
Revenue 6,851 23,379 28,401
Thailand | Fabrication      
Disclosure Of Operating Segments [Line Items]      
Revenue     0
ROW      
Disclosure Of Operating Segments [Line Items]      
Revenue 200,198 184,723 171,848
ROW | At a point in time      
Disclosure Of Operating Segments [Line Items]      
Revenue 173,004 158,510 146,991
ROW | Over time      
Disclosure Of Operating Segments [Line Items]      
Revenue 27,194 26,213 24,857
ROW | SDI      
Disclosure Of Operating Segments [Line Items]      
Revenue 55,028 44,722  
ROW | Power      
Disclosure Of Operating Segments [Line Items]      
Revenue 140,501 135,739 127,891
ROW | Enamel      
Disclosure Of Operating Segments [Line Items]      
Revenue 1,972 0 0
ROW | Others      
Disclosure Of Operating Segments [Line Items]      
Revenue 2,697 4,262 4,481
ROW | Fabrication      
Disclosure Of Operating Segments [Line Items]      
Revenue     39,476
Corporate expense adjustments and eliminations      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | At a point in time      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | Over time      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | SDI      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0  
Corporate expense adjustments and eliminations | Power      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | Enamel      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | Others      
Disclosure Of Operating Segments [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | Fabrication      
Disclosure Of Operating Segments [Line Items]      
Revenue     $ 0
Segment operating profit/(loss)      
Disclosure Of Operating Segments [Line Items]      
Segment operating assets 353,844 356,473  
Total assets 353,844 356,473  
Segment operating liabilities 145,070 152,096  
Total liabilities 145,070 152,096  
Segment operating profit/(loss) | North Asia      
Disclosure Of Operating Segments [Line Items]      
Segment operating assets 52,519 54,534  
Total assets 52,519 54,534  
Segment operating liabilities 10,320 13,649  
Total liabilities 10,320 13,649  
Segment operating profit/(loss) | Thailand      
Disclosure Of Operating Segments [Line Items]      
Segment operating assets 167,888 168,423  
Total assets 167,888 168,423  
Segment operating liabilities 66,385 62,584  
Total liabilities 66,385 62,584  
Segment operating profit/(loss) | ROW      
Disclosure Of Operating Segments [Line Items]      
Segment operating assets 133,437 133,516  
Total assets 133,437 133,516  
Segment operating liabilities 68,365 75,863  
Total liabilities 68,365 75,863  
Corporate expense adjustments and eliminations      
Disclosure Of Operating Segments [Line Items]      
Segment operating assets 12,820 14,546  
Total assets 12,820 14,546  
Segment operating liabilities 6,973 7,495  
Total liabilities 6,973 7,495  
Segment reconciling items      
Disclosure Of Operating Segments [Line Items]      
Corporate and other assets 4,211 6,598  
Investment in associates 810 805  
Deferred tax assets 7,799 7,143  
Corporate liabilities 3,133 3,298  
Deferred tax liabilities $ 3,840 $ 4,197