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Revolving Credit Facility - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Nov. 10, 2014
Subsequent Event [Member]
Sep. 30, 2014
September 30, 2014 [Member]
Sep. 30, 2014
September 30, 2015 [Member]
Sep. 30, 2014
Thereafter [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]                                
Line of credit facility expiration date     Oct. 01, 2017                          
Revolving credit facility borrowing capacity $ 16,500,000   $ 16,500,000                          
Outstanding borrowings on the revolving credit facility                             0 0
Letters of credit outstanding amount 25,100,000   25,100,000                          
LIBOR plus rate                             1.75%  
Line of credit facility commitment fee description     The Agreement also provides for an unused commitment fee of 0.25% per annum on the average daily unused amount of the revolving credit facility.                          
Unused commitment fee on unused amount                             0.25%  
Interest calculation under revolving credit facility                             The rate is calculated based on LIBOR plus 1.75%  
Reduction in borrowing capacity                         2,500,000      
Minimum Fixed Charge Coverage Ratio                           1.25    
Funded debt to EBITDA ratio                   1.75 1.5 1.25        
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                          
Workers' compensation liabilities 208,343,000 95,980,000 208,343,000 95,980,000 122,506,000 112,444,000 84,543,000 70,564,000                
Total workers' compensation claims expense 101,159,000 22,398,000 140,162,000 57,513,000                        
Payment of waiver fee                 $ 20,000