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Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - Agreement [Member] - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]                
Credit facility borrowing used   $ 5,900,000       $ 5,900,000    
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 and 0.95% on standalone, fully secured letters 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 safety incentive liabilities   100.00% 100.00% 100.00% 100.00%      
Line of credit facility dividend restrictions           the Company may not declare or pay any dividend in excess of $0.25 per share in total each fiscal quarter, subject to increase by no more than 10% each year beginning June 30, 2019, compared to the prior fiscal year    
Dividends, per share   $ 0.25       $ 0.25    
Dividend to be payable date           Jun. 30, 2019    
Minimum [Member]                
Line of Credit Facility [Line Items]                
EBITDA $ 30,000,000 $ 30,000,000 $ 30,000,000 $ 30,000,000 $ 30,000,000 $ 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    
Percentage of dividend payable           10.00%    
Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Credit facility borrowing capacity             $ 28,000,000  
Credit facility, expiration date           Jul. 01, 2020    
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   $ 7,500,000       $ 7,500,000 $ 7,500,000  
Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Unused commitment fee on unused amount           1.75%    
Fully Secured Letter of Credit [Member]                
Line of Credit Facility [Line Items]                
Unused commitment fee on unused amount           0.95%    
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, 2019              
Percentage of initial fee under letter of credit           2.50%    
Percentage of aggregate fee under letter of credit           95.00%    
Percentage of annual fee under letter of credit   1.25%       1.25%    
Chubb Letter of Credit [Member] | Collateral Accounts [Member]                
Line of Credit Facility [Line Items]                
Percentage of deposit in collateral accounts           50.00%    
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   $ 4,200,000       $ 4,200,000   $ 4,400,000
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%