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Senior Debt - Summary of Debt (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total outstanding borrowings $ 114,833,000 $ 123,193,000
Less: current portion 11,296,000 8,827,000
Total debt, less current portion 103,537,000 114,366,000
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 113,903,000 125,072,000
China Facility [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility 0 1,300,000
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 112,069,000 121,897,000
US Dollar Borrowings [Member] | U.S. Dollar Revolving Loans [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility 1,000,000  
US Dollar Borrowings [Member] | China Facility [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility   1,296,000
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount (2,834,000) $ (3,175,000)
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | US Dollar Borrowings [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings $ 2,764,000