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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total outstanding borrowings $ 114,787 $ 123,193
Less: current portion 7,742 8,827
Total debt, less current portion 107,045 114,366
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 117,415 125,072
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount and debt issuance costs (2,841) (3,175)
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 114,574 121,897
US Dollar Borrowings [Member] | China Facility [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility   $ 1,296
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | US Dollar Borrowings [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility $ 213