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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total outstanding borrowings $ 74,456 $ 114,833
Less: current portion   11,296
Total debt, less current portion 74,456 103,537
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings 76,147 113,903
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount (1,691) (2,834)
US Dollar Borrowings [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings $ 74,456 112,069
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