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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax assets:    
Workers' compensation claims liabilities $ 12,151 $ 9,261
MCC accrual 1,458 2,234
Customer incentives 333 2,718
Deferred compensation 1,988 1,541
Equity based compensation 913 994
Tax effect of unrealized losses, net   1,966
State credit carryforward 923 988
State loss carryforward 33 2,396
Operating lease liability 5,920  
Other 1,345 1,703
Deferred tax assets, gross total 25,064 23,801
Less: valuation allowance 173 264
Deferred tax assets, net total 24,891 23,537
Deferred income tax liabilities:    
Tax depreciation in excess of book depreciation (3,421) (4,258)
Tax amortization of goodwill (10,312) (9,948)
Tax effect of unrealized gains, net (1,058)  
Operating lease right-of-use (5,588)  
Other (1,724) (873)
Deferred Tax Liabilities, gross total (22,103) (15,079)
Net deferred income tax assets $ 2,788 $ 8,458