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Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Restricted certificates of deposit current $ 26,015,000 $ 0
Restricted certificates of deposit noncurrent $ 88,320,000 114,335,000
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.  
Maximum amount of capital expenditures in 2015 $ 5,000,000  
Maximum amount of capital expenditures in 2016 4,000,000  
Wells Fargo [Member]    
Line of Credit Facility [Line Items]    
Term loan payment due September 30, 2015 7,000,000  
Term loan payment due December 31, 2015 15,000,000  
Term loan payment due June 30, 2016 5,000,000  
Term loan payment due September 30, 2016 $ 5,000,000  
Minimum [Member]    
Line of Credit Facility [Line Items]    
Minimum fixed charge coverage ratio 1.5  
Ratio of restricted and unrestricted cash and marketable securities to workers' compensation and safety incentive liabilities 1.0  
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  
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Outstanding balance on term loan and revolving credit facility $ 37,000,000 40,000,000
Term loan from Bank, Interest rate description One month LIBOR plus 2.25%  
LIBOR plus rate 2.25%  
Term loan with principal bank $ 4,900,000 $ 5,100,000
Payment of monthly 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] | 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%  
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Outstanding balance on term loan and revolving credit facility $ 3,200,000  
Unused commitment fee on unused amount 0.35%  
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%  
Standby Letters of Credit [Member] | Wells Fargo [Member]    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity $ 5,000,000  
Cash-Secured Letters of Credit [Member]    
Line of Credit Facility [Line Items]    
Unused commitment fee on unused amount 1.75%  
Cash-Secured Letters of Credit [Member] | Wells Fargo [Member]    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity $ 114,300,000  
Cash-Secured Letters of Credit [Member] | Wells Fargo [Member] | Certificate of Deposit [Member]    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity $ 114,300,000