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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred tax assets: |  |  |
Carry-forward losses and credits | $ 25,834 | $ 50,673 |
Inventory and warranty reserves | 17,734 | 24,253 |
Accrued expenses and other reserves | 15,393 | 16,176 |
Stock-based compensation | 5,092 | 8,995 |
Executive supplemental retirement benefits | 4,984 | 6,888 |
Other | 597 |  |
Total deferred tax assets | 69,634 | 106,985 |
Deferred tax liabilities: |  |  |
Acquired intangible assets | (83,092) | (127,571) |
Depreciation and amortization | (10,150) | (16,428) |
Loan costs | (2,157) | (7,282) |
Foreign withholding taxes | (16,206) |  |
Unrealized gain | (469) | (3,195) |
Other |  | (1,336) |
Total deferred tax liabilities | (112,074) | (155,812) |
Valuation allowance | (13,629) | (12,527) | $ (6,127)
Net deferred tax (liabilities) assets | $ (56,069) | $ (61,354) |

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