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)