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Segment Information - Revenue From External Customers Based Major Categories (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Geographical Areas [Line Items]      
Revenue $ 338,160 $ 425,940 $ 425,215
At a point in time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 331,190 408,992  
Over time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 6,970 16,948  
North Asia (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 76,575 103,647  
North Asia (Segment) [Member] | At a point in time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 76,575 103,647  
Thailand (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 172,379 213,424  
Thailand (Segment) [Member] | At a point in time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 172,031 213,212  
Thailand (Segment) [Member] | Over time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 348 212  
ROW (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 89,206 108,869  
ROW (Segment) [Member] | At a point in time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 82,584 92,133  
ROW (Segment) [Member] | Over time [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 6,622 16,736  
Power [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 128,179 156,901  
Power [Member] | Thailand (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 49,493 64,771  
Power [Member] | ROW (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 78,686 92,130  
Enamel [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 179,572 217,894  
Enamel [Member] | North Asia (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 76,575 103,647  
Enamel [Member] | Thailand (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 102,997 114,247  
Others [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 30,409 51,145  
Others [Member] | Thailand (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue 19,889 34,406  
Others [Member] | ROW (Segment) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue $ 10,520 $ 16,739  
Manufactured Products [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue     361,853
Distributed Products [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue     41,985
SDI [Member]      
Disclosure Of Geographical Areas [Line Items]      
Revenue     $ 21,377