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	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Deferred tax assets valuation allowance	$ 29.0		$ 29.0		$ 29.0
Decrease in effective tax rate due to federal and state tax credits	0.60%		0.20%
Net benefit effective tax rate impact associated with stock-based compensation and prior tax reserves			0.50%	0.60%
Valuation allowance release related to ODL supported foreign tax credit carryforwards		$ 16.0		$ 16.0
Decrease in effective tax rate due to ODL foreign tax credit carryforward		49.00%		14.60%
Decrease in unrecognized tax positions	$ 1.6		$ 1.6
Interest and penalties	$ 1.9		$ 1.9