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Principal Maturities of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt maturing in 2019 $ 3,413  
Debt maturing in 2020 2,500  
Debt maturing in 2021 130,227  
Debt maturing in 2022 2,500  
Debt maturing in 2023 1,250  
Total debt 139,890 $ 144,669
US and Euro Denominated Revolving Note    
Debt Instrument [Line Items]    
Debt maturing in 2021 127,727  
Total debt 127,727  
DEG China Loan    
Debt Instrument [Line Items]    
Debt maturing in 2019 913  
Total debt 913 1,919
DEG Vietnam Loan    
Debt Instrument [Line Items]    
Debt maturing in 2019 2,500  
Debt maturing in 2020 2,500  
Debt maturing in 2021 2,500  
Debt maturing in 2022 2,500  
Debt maturing in 2023 1,250  
Total debt $ 11,250 $ 13,750