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Employee Benefits - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
2014 Omnibus Incentive Plan [Member]
Jun. 18, 2014
Board of Directors [Member]
Restricted Stock [Member]
Sep. 30, 2014
Board of Directors [Member]
Restricted Stock [Member]
Sep. 30, 2013
Board of Directors [Member]
Restricted Stock [Member]
Jun. 18, 2014
Board of Directors [Member]
Restricted Stock [Member]
Sep. 30, 2014
IBNR Reserves [Member]
Dec. 31, 2013
IBNR Reserves [Member]
Sep. 30, 2014
Medical IBNR Included in Accrued Compensation [Member]
Dec. 31, 2013
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]                            
Employee contributions healthcare expense net $ 2,143,000 $ 1,998,000 $ 6,737,000 $ 5,822,000                    
Accrued compensation 11,370,000   11,370,000   8,942,000               1,089,000 913,000
Workers' compensation expense 2,335,000 948,000 5,955,000 4,041,000                    
Workers compensation included in other current liabilities                     2,071,000 1,660,000    
Workers compensation included in other long term liabilities                     4,825,000 4,260,000    
Accrued insurance included in other current liabilities                     1,453,000 1,012,000    
Accrued insurance included in other long term liabilities                     4,447,000 3,266,000    
Insurance claim receivables 2,771,000   2,771,000   2,055,000                  
Share based compensation issued to directors             23,490              
Share issued price                   $ 12.77        
Compensation expense               300,000 0          
Unrecognized compensation expense               $ 0            
Granted ,shares                 0          
Vested ,shares                 0          
Forfeited, shares           0                
Common stock, shares authorized 100,000,000   100,000,000   27,200,862 100,000,000                
Shares available for issuance           2,976,510