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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total outstanding borrowings $ 84,704 $ 114,833
Less: current portion   11,296
Total debt, less current portion 84,704 103,537
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 85,747 113,903
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 84,704 112,069
US Dollar Borrowings [Member] | U.S. Dollar Revolving Loans [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility 1,500 1,000
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount $ (2,543) (2,834)
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | US Dollar Borrowings [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings   $ 2,764