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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total outstanding borrowings $ 116,932 $ 123,193
Less: current portion 9,645 8,827
Total debt, less current portion 107,287 114,366
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 115,911 125,072
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 115,318 121,897
US Dollar Borrowings [Member] | U.S. Dollar Revolving Loans [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility 2,000  
US Dollar Borrowings [Member] | China Facility [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility   1,296
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount and debt issuance costs (2,593) $ (3,175)
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | US Dollar Borrowings [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility $ 1,614