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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Gross deferred income tax assets:    
Workers' compensation claims liabilities $ 11,190 $ 12,168
MCC accrual 3,532 3,282
Safety incentives payable 5,851 3,782
Allowance for doubtful accounts 109 118
Deferred compensation 219 10
Equity based compensation 719 588
Tax effect of unrealized losses, net (3) 856
Alternative minimum tax credit carryforward 1,831 1,831
State credit carryforward 712 882
State loss carryforward 0 506
Workers' opportunity tax credit and EZ credit carryforward 0 2,986
Other 436 126
Deferred tax assets, gross total 24,596 27,135
Less valuation allowance 216 1,078
Deferred tax assets, net total 24,380 26,057
Gross deferred income tax liabilities:    
Tax depreciation in excess of book depreciation (4,243) (3,771)
Tax amortization of goodwill (12,395) (11,588)
Other (57) (117)
Deferred Tax Liabilities, gross total (16,695) (15,476)
Net deferred income tax assets $ 7,685 $ 10,581