Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating losses	$ 138	$ 347
Warranty reserve	12,904	13,032
Stock-based compensation	1,554	2,931
Accruals not currently deductible and other	6,195	5,221
Inventories	4,406	4,437
State tax credit carryforwards	4,350	4,050
Gross deferred tax assets, before valuation allowance	29,547	30,018
Valuation allowance	(4,582)	(4,465)
Gross deferred tax assets, after valuation allowance	24,965	25,553
Deferred tax liabilities:
Depreciation and other	(20,426)	(19,990)
Gross deferred tax liabilities	(20,426)	(19,990)
Net deferred tax asset	$ 4,539	$ 5,563