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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 483 | $ 9,962
Warranty reserve | 16,085 | 11,406
Stock-based compensation | 2,383 | 2,654
Accruals not currently deductible and other | 6,210 | 8,193
Inventories | 3,843 | 5,008
State tax credit carryforwards | 3,714 | 4,105
Gross deferred tax assets, before valuation allowance | 32,718 | 41,328
Valuation allowance | (4,201) | (24,131)
Gross deferred tax assets, after valuation allowance | 28,517 | 17,197
Deferred tax liabilities: |  |
Depreciation and other | (19,380) | (20,758)
Gross deferred tax liabilities | (19,380) | (20,758)
Net deferred tax asset (liability) | $ 9,137 | $ (3,561)

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