Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 25, 2021
Outstanding Restricted Stock and Stock Success Unit Grant Prices Lower Limit	$ 12.45		$ 12.45
Outstanding Restricted Stock and Stock Success Unit Grant Prices Upper Limit	$ 37.67		$ 37.67
Antidilutive Securities Excluded from Computation of Earnings Per Share	1,300,000	2,000,000.0	1,100,000	1,600,000
Expiration Date of Share Repurchase Program Authorized in October 2021			Dec. 31, 2022
Authorized Shares of Preferred Stock	25,000,000.0		25,000,000.0
Par Value Per Share of Preferred Stock	$ 0.10		$ 0.10
Issued Shares of Preferred Stock	0		0
Repurchase Program Authorized in October 2021 | Subsequent Event
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program					$ 250.0