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Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - Agreement [Member] - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility commitment fee description |  |  |  |  | The Agreement also provides for an unused commitment fee of 0.35% per year through December 31, 2016 and 0.375% per year thereafter on the average daily unused amount of the revolving credit facility, and 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. |
Restricted certificates of deposit, current |  |  |  |  | $ 5,300,000 |
Maximum amount of capital expenditures in 2016 |  |  |  |  | 4,000,000 |
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 |
Scenario Forecast [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
EBITDA | $ 25,000,000 | $ 25,000,000 | $ 25,000,000 | $ 22,000,000 |  |
Ratio of restricted and unrestricted cash and marketable securities to workers’ compensation and safety incentive liabilities | 100.00% | 100.00% | 100.00% | 100.00% |  |
Term Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Outstanding balance on term loan and revolving credit facility |  |  |  |  |  | $ 15,000,000
Term loan from Bank, Interest rate description |  |  |  |  | One month LIBOR plus 2.25% |
Term loan with principal bank |  |  |  |  | $ 4,600,000 | 4,800,000
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 |  |  |  |  | 2.25% |
Term Loan [Member] | Wells Fargo [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 40,000,000 |
Term loan maturity date |  |  |  |  | Dec. 31, 2016 |
Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Outstanding balance on term loan and revolving credit facility |  |  |  |  | $ 0 | $ 0
Unused commitment fee on unused amount during period |  |  |  |  | 0.35% |
Unused commitment fee on unused amount after amendment |  |  |  |  | 0.375% |
Credit facility, expiration date |  |  |  |  | Jul. 01, 2018 |
Revolving Credit Facility [Member] | Daily Floating Rate [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Term loan from Bank, Interest rate description |  |  |  |  | A daily floating rate of one month 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 |  |  |  |  | A fixed rate of LIBOR plus 1.75% |
LIBOR plus rate |  |  |  |  | 1.75% |
Revolving Credit Facility [Member] | Wells Fargo [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 25,000,000 |
Standby Letters of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility borrowing used |  |  |  |  | 5,300,000 |
Standby Letters of Credit [Member] | Wells Fargo [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 6,000,000 |
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% |
Fully Secured Letter of Credit [Member] | Wells Fargo [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 5,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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