Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating losses	$ 123	$ 93
Residential product warranty reserve	8,876	14,510
Stock-based compensation	1,823	2,186
Accruals not currently deductible and other	1,838	2,261
Inventories	3,783	5,785
State tax credit carryforwards	3,619	4,020
Gross deferred tax assets, before valuation allowance	20,062	28,855
Valuation allowance	(3,096)	(4,061)
Gross deferred tax assets, after valuation allowance	16,966	24,794
Deferred tax liabilities:
Depreciation and other	(18,055)	(25,688)
Gross deferred tax liabilities	(18,055)	(25,688)
Net deferred tax (liability) asset	$ (1,089)	$ (894)