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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total outstanding borrowings $ 79,175 $ 114,833
Less: current portion   11,296
Total debt, less current portion 79,175 103,537
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 81,147 113,903
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 79,175 112,069
US Dollar Borrowings [Member] | U.S. Dollar Revolving Loans [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under Credit Facility   1,000
US Dollar Borrowings [Member] | Foreign Facility [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings   2,764
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount $ (1,972) $ (2,834)