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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |  |  |
Non-deductible reserves and accruals | $ 2,814 | $ 2,743 |  |
Net operating loss and other carryforwards | 8,719 | 13,049 |  |
Stock compensation | 1,935 | 2,651 |  |
Lease liability | 22,842 | 17,382 |  |
Gross deferred tax asset | 36,310 | 35,825 |  |
Less - valuation allowance | (1,237) | (2,274) | $ (2,574) | $ (2,686)
Sub-total | 35,073 | 33,551 |  |
Other liabilities | (751) | (1,085) |  |
Depreciation and amortization | (1,091) | (1,567) |  |
Goodwill and intangible assets | (27,319) | (32,120) |  |
Operating lease right-of-use assets | (19,201) | (15,005) |  |
Deferred commissions | (6,665) | (5,706) |  |
Net deferred tax asset (liability) | $ (19,954) | $ (21,932) |  |

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