Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components Of Income Tax Expense Benefit [Line Items]
Income tax effective rate	14.40%	11.50%	(43.10%)	300.30%
Internal Revenue Service [Member]
Components Of Income Tax Expense Benefit [Line Items]
Income tax benefit			$ 0.3
Minimum [Member]
Components Of Income Tax Expense Benefit [Line Items]
Decrease in unrecognized tax benefits	$ 1.0		1.0
Maximum [Member]
Components Of Income Tax Expense Benefit [Line Items]
Decrease in unrecognized tax benefits	$ 1.5		$ 1.5