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Senior Debt - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2024
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2018
Line Of Credit Facility [Line Items]              
Credit facility principal payments 2019 $ 600,000 $ 600,000          
Credit facility principal payments 2020 2,500,000 2,500,000          
Credit facility principal payments 2021 3,100,000 3,100,000          
Credit facility principal payments 2022 3,800,000 3,800,000          
Credit facility principal payments 2023 4,400,000 4,400,000          
Credit facility principal payments 2024 $ 35,000,000 $ 35,000,000          
Weighted average stated interest rate on outstanding borrowings 4.04% 4.04%         5.27%
Fair value of interest rate swap $ 0 $ 0         $ 0
Interest rate swap, fair value, asset 500,000 500,000         500,000
Debt discount expensed   928,000 $ 862,000        
Scenario Forecast [Member]              
Line Of Credit Facility [Line Items]              
Maximum consolidated leverage ratio       325.00% 350.00% 375.00%  
Other Income (Expense), Net [Member]              
Line Of Credit Facility [Line Items]              
Change in fair value of interest rate swap recognized as income 0 $ 200,000          
Amended and Restated Credit Agreement [Member]              
Line Of Credit Facility [Line Items]              
Debt instrument extended maturity date   Jun. 11, 2024          
Customary closing fees   $ 1,100,000          
Debt discount expensed   400,000          
Credit Agreement [Member]              
Line Of Credit Facility [Line Items]              
Unused credit availability under credit facility 108,500,000 108,500,000         50,700,000
Term Loan [Member] | Amended and Restated Credit Agreement [Member]              
Line Of Credit Facility [Line Items]              
Increased credit facility commitment for either revolving credit facility or term loan facility 50,000,000 50,000,000          
Revolving Credit Loan [Member]              
Line Of Credit Facility [Line Items]              
Bank guarantee agreement outstanding amount 20,000,000 20,000,000          
Revolving Credit Loan [Member] | Amended and Restated Credit Agreement [Member]              
Line Of Credit Facility [Line Items]              
Aggregate principal amount outstanding under the credit facilities 140,000,000 140,000,000          
Letters of Credit [Member]              
Line Of Credit Facility [Line Items]              
Aggregate principal amount outstanding under the credit facilities 11,500,000 11,500,000         $ 29,300,000
Bank Guarantees [Member]              
Line Of Credit Facility [Line Items]              
Bank guarantee issuance under bilateral lines and collateral 50,000,000 50,000,000          
Bank guarantee agreement outstanding amount 11,000,000 11,000,000          
Netherlands Facility [Member] | Euro-Denominated Bank Guarantee [Member]              
Line Of Credit Facility [Line Items]              
Bank guarantee agreement outstanding amount $ 3,400,000 $ 3,400,000