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INCOME TAX - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Operating expenses not currently deductible | $ 9,084 | $ 10,214
Stock option and other employee benefit plans | 17,446 | 19,308
Loss and credit carryforwards | 27,199 | 23,841
Total deferred income tax assets | 53,729 | 53,363
Valuation allowance | (1,490) | (1,923)
Total deferred income tax assets, net of valuation allowance | 52,239 | 51,440
Deferred income tax liabilities: |  |
Intangible assets | (76,766) | (84,019)
Property and equipment | (9,918) | (9,265)
Prepaid expenses | (6,869) | (4,922)
Deferred revenue | 807 |
Deferred revenue |  | (1,676)
Total deferred income tax liabilities | (92,746) | (99,882)
Net deferred income tax liabilities | $ (40,507) | $ (48,442)

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