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Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 19, 2021
USD ($)
Mar. 11, 2020
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                
Loss on extinguishment of debt   $ 8,800,000   $ 0 $ 0 $ 8,778,000 $ 0  
Debt issuance costs, net       $ 1,485,000   $ 1,485,000   $ 9,066,000
New Credit Agreement                
Debt Instrument [Line Items]                
Repayments of debt     $ 25,000,000          
Debt issuance costs, net $ 1,700,000              
Debt, weighted average interest rate       2.13%   2.13%    
Maximum total net leverage ratio 3.5              
Decrease maximum total net leverage ratio 3.0              
Minimum fixed charge coverage ratio 1.25              
New Credit Agreement | Maximum                
Debt Instrument [Line Items]                
Line of credit facility, commitment fee percentage 0.275%              
London Interbank Offered Rate (LIBOR) | New Credit Agreement                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate           0.086%    
Debt instrument, margin rate           1.75%    
London Interbank Offered Rate (LIBOR) | New Credit Agreement | Minimum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 1.75%              
London Interbank Offered Rate (LIBOR) | New Credit Agreement | Maximum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 2.50%              
Base Rate | New Credit Agreement | Minimum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 0.75%              
Base Rate | New Credit Agreement | Maximum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 1.50%              
Medium-term Notes                
Debt Instrument [Line Items]                
Principal amount   $ 170,000,000            
Debt instrument, LIBOR floor rate   1.00%            
Medium-term Notes | Term Loan due 2026                
Debt Instrument [Line Items]                
Long-term debt, gross $ 125,000,000     $ 123,438,000   $ 123,438,000   0
Debt issuance costs, net 1,200,000              
Medium-term Notes | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate   6.50%            
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Long-term debt, gross       25,000,000   25,000,000   $ 0
Line of credit facility, maximum borrowing capacity 50,000,000              
Line of credit facility, remaining borrowing capacity       $ 25,000,000   $ 25,000,000    
Line of credit facility, unused capacity, commitment fee percentage           0.218%    
Debt issuance costs, net 500,000              
Line of Credit | Letter of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity $ 10,000,000              
Line of Credit | New Credit Agreement | Minimum                
Debt Instrument [Line Items]                
Line of credit facility, commitment fee percentage 0.20%