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Principal Maturities of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt maturing in 2018 $ 3,460  
Debt maturing in 2019 3,459  
Debt maturing in 2020 2,500  
Debt maturing in 2021 131,500  
Debt maturing in 2022 2,500  
Thereafter 1,250  
Total debt 144,669 $ 171,525
Revolving Note (U.S. Dollar)    
Debt Instrument [Line Items]    
Debt maturing in 2021 129,000  
Total debt 129,000 154,000
DEG China Loan    
Debt Instrument [Line Items]    
Debt maturing in 2018 960  
Debt maturing in 2019 959  
Total debt 1,919 2,525
DEG Vietnam Loan    
Debt Instrument [Line Items]    
Debt maturing in 2018 2,500  
Debt maturing in 2019 2,500  
Debt maturing in 2020 2,500  
Debt maturing in 2021 2,500  
Debt maturing in 2022 2,500  
Thereafter 1,250  
Total debt $ 13,750 $ 15,000