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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total outstanding borrowings $ 80,895 $ 114,833
Less: current portion   11,296
Total debt, less current portion 80,895 103,537
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 83,147 113,903
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 80,895 112,069
US Dollar Borrowings [Member] | U.S. Dollar Revolving Loans [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility   1,000
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount $ (2,252) (2,834)
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | US Dollar Borrowings [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings   $ 2,764