Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - Agreement [Member] - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
May 14, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]                
Credit facility borrowing used     $ 5,800,000     $ 5,800,000    
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   $ 0
Ratio of restricted and unrestricted cash and investments to workers' compensation and claim liabilities     1.00% 1.00% 1.00%      
Dividends or distributions paid           0    
Maximum amount to redeem retire repurchase or acquire stock upon agreement           15,000,000    
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%            
Minimum [Member]                
Line of Credit Facility [Line Items]                
EBITDA     $ 30,000,000 $ 30,000,000 $ 30,000,000 30,000,000    
Minimum [Member] | Scenario Forecast [Member]                
Line of Credit Facility [Line Items]                
EBITDA   $ 30,000,000            
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    
Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Credit facility borrowing capacity     33,000,000.0     $ 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%    
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%    
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%    
Standby Letters of Credit [Member]                
Line of Credit Facility [Line Items]                
Credit facility borrowing capacity     8,000,000.0     $ 8,000,000.0    
Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Unused commitment fee on unused amount           1.75%    
Chubb Letter of Credit [Member]                
Line of Credit Facility [Line Items]                
Credit facility borrowing capacity     $ 63,700,000     $ 63,700,000    
Credit facility, expiration date           Jul. 01, 2021    
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%     1.00%    
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     $ 32,500,000     $ 32,500,000    
Chubb Letter of Credit [Member] | Collateral Accounts [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Deposit in collateral accounts     16,000,000     $ 16,000,000    
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     $ 3,800,000     $ 3,800,000   $ 4,000,000.0
Payment of monthly principal of term loan           $ 18,375    
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Line of Credit Facility [Line Items]                
LIBOR plus rate           2.00%