Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Federal net operating losses for income tax		$ 6,300	$ (12,200)
Deferred Tax Assets, Operating Loss Carryforwards	$ 1,587	5,523
Net Operating Losses and Tax Carryback	(1,841)
Deferred State and Local Income Tax Expense (Benefit)	4,900	4,700	$ 3,500
Deferred Tax Assets, Operating Loss Carryforwards, Total	1,600	5,500
Net Operating Losses and Tax Carryback, Total	(1,800)
Deferred Tax Assets, Operating Loss Carryforwards	$ 1,587	5,523
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%
State
Operating Loss Carryforwards [Line Items]
Federal net operating losses for income tax	$ 40,000	$ 54,700