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Debt and Short-Term Borrowings - Additional Information (Detail)
3 Months Ended 9 Months Ended
Mar. 05, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
agreement
Nov. 27, 2018
USD ($)
Debt Instrument [Line Items]            
Gains reclassified from accumulated other comprehensive loss into income   $ 1,700,000   $ 3,300,000    
Losses expected to be reclassified from accumulated other comprehensive loss into income in the next 12 months   6,800,000   6,800,000    
Interest Rate Swap Maturing April 2020 Agreement            
Debt Instrument [Line Items]            
Notional amount   $ 200,000,000   $ 200,000,000    
Fixed rate   1.9225%   1.9225%    
Credit Agreement 2018            
Debt Instrument [Line Items]            
Mandatory prepayment trigger, maximum value of excess cash flow     $ 10,000,000      
Credit Facility | Credit Agreement 2018            
Debt Instrument [Line Items]            
Credit facility, payment $ 17,000,000.0          
Notes Payable | December 2019 Financing Agreement            
Debt Instrument [Line Items]            
Number of financing agreements | agreement         2  
Non interest bearing financing agreement         $ 2,400,000  
Notes payable   $ 1,500,000   $ 1,500,000 $ 2,400,000  
Term A due on November 27,2023 | Credit Facility            
Debt Instrument [Line Items]            
Secured credit facilities   $ 192,800,000   $ 192,800,000    
Fixed rate   2.00%   2.00% 2.00%  
Term A due on November 27,2023 | Credit Facility | Credit Agreement 2018            
Debt Instrument [Line Items]            
Maximum amount under credit facilities           $ 220,000,000.0
Term B due on November 27, 2024 | Credit Facility            
Debt Instrument [Line Items]            
Secured credit facilities   $ 310,300,000   $ 310,300,000    
Term B due on November 27, 2024 | Credit Facility | Credit Agreement 2018            
Debt Instrument [Line Items]            
Maximum amount under credit facilities           325,000,000.0
Senior Secured Revolving Credit Facility | Credit Facility            
Debt Instrument [Line Items]            
Additional borrowing capacity available under the revolving facility   101,700,000   101,700,000    
Senior Secured Revolving Credit Facility | Credit Facility | Credit Agreement 2018            
Debt Instrument [Line Items]            
Maximum amount under credit facilities           $ 125,000,000.0
Carrying Amount            
Debt Instrument [Line Items]            
Interest rate swap   $ 27,370,000   $ 27,370,000 $ 14,452,000