Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of interest expense accrued for an underpayment of income taxes.

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Income Taxes [Line Items]

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Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Tax benefit related to effects of TCJA	$ 2.3
Statutory federal income tax rate	21.00%	35.00%	35.00%
Uncertain tax position, accrued interest		$ 1.8	$ 4.6
Federal
Income Taxes [Line Items]
Operating loss carryforwards	$ 80.2
Obligations of states and state agencies
Income Taxes [Line Items]
Operating loss carryforwards	104.0
Capital loss carryforward
Income Taxes [Line Items]
Capital loss carryforwards	$ 3.1