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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Unamortized debt discount $ (1,551) $ (1,796)
Total outstanding borrowings 111,690 112,428
Less: current portion 12,317 8,887
Total debt, less current portion 99,373 103,541
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 85,690 90,072
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 108,139 112,276
US Dollar Borrowings [Member] | U.S. Dollar Revolving Loans [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility 24,000 24,000
U S Dollar Euro [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 82 $ 152
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | US Dollar Borrowings [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings $ 3,469