Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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)