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Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - Agreement [Member] - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |  |
Restricted money market funds and restricted certificates of deposit, current |  | $ 44,000,000 |
Line of credit facility commitment fee description |  | The Agreement also provides for an unused commitment fee of 0.35% per year 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 |
Amount divided to calculate amended fixed charge coverage ratio |  | $ 9,425,000 |
Maximum amount of capital expenditures in 2016 |  | 4,000,000 |
Wells Fargo [Member] | Due on September 30, 2016 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan payment |  | 5,000,000 |
Wells Fargo [Member] | Due on December 31, 2016 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan payment |  | $ 2,500,000 |
Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Minimum fixed charge coverage ratio | 150.00% | 225.00% |
Ratio of restricted and unrestricted cash and marketable securities to workers' compensation and safety incentive liabilities |  | 100.00% |
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing |  | $ 200,000 |
Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing |  | $ 400,000 |
Cash dividend |  | $ 0.22 |
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 |  | 0.35% |
Credit facility, expiration date |  | Oct. 01, 2017 |
Revolving Credit Facility [Member] | Wells Fargo [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing capacity |  | $ 14,000,000 |
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 2.0% |
LIBOR plus rate |  | 2.00% |
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 2.0% |
LIBOR plus rate |  | 2.00% |
Unsecured Letters Of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Unused commitment fee on unused amount |  | 1.75% |
Term Loan [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding balance on term loan and revolving credit facility |  | $ 7,500,000 | 15,000,000
Term loan from Bank, Interest rate description |  | One month LIBOR plus 2.25% |
Term loan with principal bank |  | $ 4,700,000 | $ 4,800,000
Payment of monthly principal installments of term loan |  | 18,375 |
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 |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
LIBOR plus rate |  | 2.25% |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Wells Fargo [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan from Bank, Interest rate description |  | One month LIBOR plus 4.0% |
LIBOR plus rate |  | 4.00% |
Standby Letters of Credit [Member] | Wells Fargo [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing capacity |  | $ 6,000,000 |
Cash-Secured Letters of Credit [Member] | Wells Fargo [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing capacity |  | $ 42,300,000 |

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