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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Workers' compensation claims liabilities $ 8,124 $ 11,477
MCC accrual 3,390 4,561
Safety incentives payable   7,779
Deferred compensation 1,040  
Equity based compensation 811 991
Tax effect of unrealized losses, net 523 (17)
Alternative minimum tax credit carryforward 1,815 1,648
State credit carryforward 988 868
State loss carryforward 2,715  
Other 354 796
Deferred tax assets, gross total 19,760 28,103
Less valuation allowance 264 216
Deferred tax assets, net total 19,496 27,887
Deferred income tax liabilities:    
Tax depreciation in excess of book depreciation (3,220) (5,319)
Tax amortization of goodwill (9,558) (13,191)
Other (884) (7)
Deferred Tax Liabilities, gross total (13,662) (18,517)
Net deferred income tax assets $ 5,834 $ 9,370