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Senior Debt - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
Line Of Credit Facility [Line Items]        
Payment on outstanding balance $ 0      
Final scheduled principal payment due in September 2020 $ 76,100,000      
Weighted average stated interest rate on outstanding borrowings 5.25%     5.27%
Interest rate swap, fair value, asset $ 300,000     $ 500,000
Maximum consolidated leverage ratio 375.00%      
Scenario Forecast [Member]        
Line Of Credit Facility [Line Items]        
Maximum consolidated leverage ratio   325.00% 350.00%  
Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Unused credit availability under credit facility $ 52,600,000     50,700,000
Letters of Credit [Member]        
Line Of Credit Facility [Line Items]        
Aggregate principal amount outstanding under the credit facilities 27,400,000     $ 29,300,000
Netherlands Facility [Member] | Euro-Denominated Bank Guarantee [Member]        
Line Of Credit Facility [Line Items]        
Bank guarantee agreement outstanding amount $ 3,100