Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Tax Cuts and Jobs Act of 2017, tax benefit			$ 13,000
Excess tax benefit over compensation cost recognized, amount	$ 800	$ 200	600
Operating loss carryforward not expected to be realized under ASC subtopic 740-10	16,900
Tax credit carryforwards	84	288
Tax credit carryforwards valuation allowance	9,375	9,083
Unrecognized tax benefits	5,663	$ 5,283	$ 5,271	$ 3,036
Unrecognized tax benefits that would impact effective tax rate	4,000
Decrease in unrecognized tax benefits is reasonably possible	2,000
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	22,500
Tax credit carryforwards	100
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	26,500
Tax credit carryforwards	12,800
Tax credit carryforwards valuation allowance	$ 10,700