XML 50 R39.htm IDEA: XBRL DOCUMENT v3.5.0.2
Employee Benefits - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2016
USD ($)
Installment
shares
Jun. 30, 2015
USD ($)
Installment
shares
Dec. 31, 2015
USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Healthcare benefit expense, net of employee contributions $ 3,500 $ 3,100 $ 7,700 $ 5,800  
Accrued compensation 18,826   18,826   $ 14,488
Workers compensation expense 2,800 2,000 $ 5,800 $ 4,100  
Common stock granted, shares | shares     143,528    
Unrecognized compensation expense 3,800   $ 3,800    
Common nonvested shares, compensation cost not yet recognized, period for recognition     2 years 8 months 12 days    
2014 Omnibus Incentive Plan [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Common stock granted, shares | shares     100,000 100,000  
Share based compensation expenses 300 $ 600 $ 900 $ 700  
Number of equal installments for vesting common stock | Installment     3 3  
Number of shares surrendered to satisfy tax withholding obligations | shares     32,000    
Share based compensation, recognized tax benefits $ 49   $ 300    
Common stock vested percentage       100.00%  
Common stock shares available for issuance | shares 2,700,000   2,700,000    
2014 Omnibus Incentive Plan [Member] | Directors [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Common stock granted, shares | shares 9,000 13,000      
Share based compensation expenses $ 300 $ 300 $ 300 $ 300  
Medical IBNR Included in Accrued Compensation [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Accrued compensation $ 1,600   $ 1,600   $ 1,500