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Debt and Short-Term Borrowings - Additional Information (Detail)
3 Months Ended 6 Months Ended
Mar. 08, 2021
USD ($)
Mar. 05, 2020
USD ($)
Nov. 27, 2018
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
agreement
Debt Instrument [Line Items]                  
Losses reclassified from accumulated other comprehensive loss into income       $ 1,800,000 $ 1,400,000 $ 3,500,000 $ 1,600,000    
Losses expected to be reclassified from accumulated other comprehensive loss into income in the next 12 months       7,000,000.0   7,000,000.0      
Credit Agreement 2018                  
Debt Instrument [Line Items]                  
Mandatory prepayment trigger, maximum value of excess cash flow     $ 10,000,000            
Credit facility, payment $ 17,800,000 $ 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       800,000   800,000   $ 1,500,000  
Term A due on November 27,2023 | Credit Facility                  
Debt Instrument [Line Items]                  
Secured credit facilities       $ 177,100,000   $ 177,100,000      
Fixed rate       1.75%   1.75%   1.75%  
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       $ 297,500,000   $ 297,500,000      
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       119,100,000   119,100,000      
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       19,768,000   19,768,000   $ 25,578,000  
Fair Value, Level 2 | Carrying Amount                  
Debt Instrument [Line Items]                  
Interest rate swap       $ 19,800,000   $ 19,800,000   $ 25,600,000