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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Aug. 06, 2019 | Aug. 05, 2019 | Dec. 31, 2018
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 safety incentive liabilities |  | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |
Maximum amount to redeem retire repurchase or acquire stock upon agreement |  |  |  |  |  | 15,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
EBITDA |  | $ 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 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  | $ 33,000,000 | $ 28,000,000 |
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 | $ 7,500,000 |
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, 2020 |  |  |
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] |  |  |  |  |  |  |  |  |
Deposit in collateral accounts |  | $ 28,600,000 |  |  |  | $ 28,600,000 |  |  |
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 |  | $ 4,000,000 |  |  |  | $ 4,000,000 |  |  | $ 4,200,000
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% |  |  |

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