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Restructuring and Other Gain - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restricted cash   $ 18,251    
Gain on sale of machinery and building as part of restructuring       $ 17,010
Sensor Business [Member]        
Restructuring Cost and Reserve [Line Items]        
Proceeds from sale of business $ 1,295      
Net gain on sale of business $ 375      
Korea [Member] | Buildings [Member]        
Restructuring Cost and Reserve [Line Items]        
Gross proceeds from sale of building   18,204    
Value-added tax, for sale of the building   1,655    
Restricted cash   18,204    
Deposits received   $ 16,549    
Decrease in restricted cash due to release     $ 18,204  
Korea [Member] | Buildings [Member] | Restructuring Gain [Member]        
Restructuring Cost and Reserve [Line Items]        
Gain on sale of machinery and building as part of restructuring     $ 16,635