Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating losses	$ 88	$ 79
Residential product warranty reserve	6,486	7,804
Stock-based compensation	1,055	1,725
Accruals not currently deductible and other	2,245	3,928
Inventories	5,780	4,682
Operating lease liability	10,618
State tax credit carryforwards	3,461	3,400
Gross deferred tax assets, before valuation allowance	29,733	21,618
Valuation allowance	(2,988)	(3,015)
Gross deferred tax assets, after valuation allowance	26,745	18,603
Deferred tax liabilities:
Depreciation	(17,267)	(13,893)
Operating lease right-of-use asset	(10,162)
Goodwill amortization	(4,782)	(3,774)
Inventories and other	(4,365)	(3,061)
Gross deferred tax liabilities	(36,576)	(20,728)
Net deferred tax liability	$ (9,831)	$ (2,125)