Income Taxes - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 27, 2020	Mar. 26, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Deferred tax assets, additional valuation allowance			$ 11.4				$ 18.1
Federal net operating losses					$ 41.4
Deferred tax assets valuation allowance retained			$ 6.7		$ 6.7
Effective income tax rate reconciliation expense (benefit), percent			1.90%	0.00%	0.00%	0.00%
Percentage of increase in interest expense deduction for 2019 and 2020 tax years	50.00%	30.00%
Additional interest expense deduction							$ 4.3