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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating losses $ 43 $ 88
Residential product warranty reserve 7,532 6,486
Stock-based compensation 1,071 1,055
Accruals not currently deductible and other 2,041 2,245
Inventories 5,548 5,780
Operating lease liability 9,081 10,618
State tax credit carryforwards 3,345 3,461
Gross deferred tax assets, before valuation allowance 28,661 29,733
Valuation allowance (2,775) (2,988)
Gross deferred tax assets, after valuation allowance 25,886 26,745
Deferred tax liabilities:    
Depreciation (29,792) (17,267)
Operating lease right-of-use asset (8,755) (10,162)
Goodwill amortization (5,775) (4,782)
Inventories and other (4,520) (4,365)
Gross deferred tax liabilities (48,842) (36,576)
Net deferred tax liability $ (22,956) $ (9,831)