Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility and Long-Term Debt - Additional Information (Detail)

v3.21.1
Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2021
Jun. 30, 2018
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 29, 2020
May 14, 2020
Line of Credit Facility [Line Items]                    
Balance in Chubb trust accounts           $ 295,400,000 $ 290,700,000   $ 115,700,000  
Agreement [Member]                    
Line of Credit Facility [Line Items]                    
Credit facility borrowing used           $ 6,200,000        
Line of credit facility commitment fee description           The Agreement also provides for an unused commitment fee of 0.375% per year on the average daily unused amount of the revolving credit line, as well as a fee of 1.75% of the face amount of each letter of credit reserved under the line of credit.        
Outstanding balance on term loan and revolving credit facility           $ 0 0      
Balance in Chubb trust accounts $ 25,000,000.0                  
Ratio of restricted and unrestricted cash and investments to workers' compensation and claim liabilities           1.00%        
Dividends or distributions paid           $ 0        
Maximum amount to redeem retire repurchase or acquire stock upon agreement           15,000,000        
Agreement [Member] | Scenario Forecast [Member]                    
Line of Credit Facility [Line Items]                    
Ratio of restricted and unrestricted cash and investments to workers' compensation and claim liabilities     1.00% 1.00% 1.00%          
Agreement [Member] | Minimum [Member]                    
Line of Credit Facility [Line Items]                    
EBITDA           30,000,000        
Agreement [Member] | Minimum [Member] | Scenario Forecast [Member]                    
Line of Credit Facility [Line Items]                    
EBITDA     $ 30,000,000 $ 30,000,000 $ 30,000,000          
Agreement [Member] | Maximum [Member]                    
Line of Credit Facility [Line Items]                    
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing           $ 1,000,000        
Agreement [Member] | Revolving Credit Facility [Member]                    
Line of Credit Facility [Line Items]                    
Credit facility borrowing capacity               $ 33,000,000.0   $ 50,000,000.0
Credit facility, expiration date           Jul. 01, 2022        
Unused commitment fee on unused amount during period           0.375%        
Agreement [Member] | Revolving Credit Facility [Member] | Daily Floating Rate [Member]                    
Line of Credit Facility [Line Items]                    
Term loan from Bank, Interest rate description           the daily floating rate of one-month LIBOR plus 1.75% or (b) the fixed rate of LIBOR plus 1.75%        
LIBOR plus rate           1.75%        
Agreement [Member] | Revolving Credit Facility [Member] | Fixed Rate [Member]                    
Line of Credit Facility [Line Items]                    
Term loan from Bank, Interest rate description           the fixed rate of LIBOR plus 1.75%        
LIBOR plus rate           1.75%        
Agreement [Member] | Standby Letters of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Credit facility borrowing capacity               $ 8,000,000.0    
Agreement [Member] | Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Unused commitment fee on unused amount           1.75%        
Agreement [Member] | Chubb Letter of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Credit facility borrowing capacity           $ 63,700,000        
Credit facility, expiration date           Jul. 01, 2021        
Collateral transferred $ 38,700,000                  
Percentage of initial fee under letter of credit   2.50%       2.50%        
Percentage of aggregate fee under letter of credit           95.00%        
Percentage of annual fee under letter of credit           1.00%        
Agreement [Member] | Chubb Letter of Credit [Member] | Collateral Accounts [Member]                    
Line of Credit Facility [Line Items]                    
Percentage of deposit in collateral accounts           50.00%        
Deposit in collateral accounts           $ 38,700,000        
Agreement [Member] | Chubb Letter of Credit [Member] | Collateral Accounts [Member] | Minimum [Member]                    
Line of Credit Facility [Line Items]                    
Deposit in collateral accounts           $ 16,000,000        
Agreement [Member] | Term Loan [Member]                    
Line of Credit Facility [Line Items]                    
Term loan from Bank, Interest rate description           one-month LIBOR plus 2.0%        
Term loan with principal bank           $ 3,700,000 $ 3,700,000      
Payment of monthly principal of term loan           $ 18,375        
Agreement [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Line of Credit Facility [Line Items]                    
LIBOR plus rate           2.00%