Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders Equity and Earnings Per Common Share Additional Information [Abstract]
Exercise Price Floor on Outstanding Stock Options			$ 23.35
Exercise Price Ceiling on Outstanding Stock Options			24.25
Outstanding Restricted Stock Unit Grant Prices Lower Limit			33.28
Outstanding Restricted Stock Unit Grant Prices Upper Limit			55.26
Outstanding Performance Share Unit Awards Grant Price Range Lower Limit			37.67
Outstanding Performance Share Unit Awards Grant Price Range Upper Limit			$ 49.86
Number of Antidilutive Securities Excluded from Computation of Earnings Per Share	1,200,000	700,000	1,200,000	400,000
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