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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Workers' compensation claims liabilities $ 9,261 $ 8,124
MCC accrual 2,234 3,390
Customer incentives 2,718  
Deferred compensation 1,541 1,040
Equity based compensation 994 811
Tax effect of unrealized losses, net 1,966 523
Alternative minimum tax credit carryforward   1,815
State credit carryforward 988 988
State loss carryforward 2,396 2,715
Other 1,703 354
Deferred tax assets, gross total 23,801 19,760
Less valuation allowance 264 264
Deferred tax assets, net total 23,537 19,496
Deferred income tax liabilities:    
Tax depreciation in excess of book depreciation (4,258) (3,220)
Tax amortization of goodwill (9,948) (9,558)
Other (873) (884)
Deferred Tax Liabilities, gross total (15,079) (13,662)
Net deferred income tax assets $ 8,458 $ 5,834