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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Workers' compensation claims liabilities $ 9,946 $ 12,151
Operating lease liability 6,107 5,920
Deferred compensation 2,235 1,988
Payroll tax deferral 1,668  
Other 1,154 1,345
MCC accrual 1,062 1,458
Equity based compensation 555 913
State credit carryforward 518 923
Customer incentives 54 333
State loss carryforward   33
Deferred tax assets, gross total 23,299 25,064
Less: valuation allowance 163 173
Deferred tax assets, net total 23,136 24,891
Deferred income tax liabilities:    
Tax amortization of goodwill (10,375) (10,312)
Tax depreciation in excess of book depreciation (7,187) (3,421)
Operating lease right-of-use (5,766) (5,588)
Tax effect of unrealized gains, net (2,871) (1,058)
Other (1,455) (1,724)
Deferred Tax Liabilities, gross total (27,654) (22,103)
Net deferred income taxes $ 4,518 $ 2,788