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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted since 2003		0
Stock options outstanding		0
Compensation expense related to share-based compensation plans		$ 16.3	$ 13.5	$ 8.6
Compensation expense related to share-based compensation plans, net of tax		$ 12.1	$ 10.1	$ 5.8
Unrecognized compensation cost weighted average period recognized (years)		2 years 10 months 28 days
Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		387,841	500,943	428,333
Restricted stock grants, Weighted average grant date fair value		$ 38.02	$ 47.34	$ 43.31
Unrecognized compensation cost related to non-vested share-based compensation		$ 4.2
Unrecognized compensation cost weighted average period recognized (years)		1 year 6 months
Time Based Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		1 year	1 year	1 year
Time Based Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		5 years	5 years	5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to share-based compensation plans		$ 3.4
Compensation expense related to share-based compensation plans, net of tax		$ 2.6
Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		76,500
Restricted stock grants, Weighted average grant date fair value		$ 37.20
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted shares vested		$ 14.7	$ 13.3	$ 10.4
Unrecognized compensation cost related to non-vested share-based compensation		$ 35.6
Restricted Stock [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants, Weighted average grant date fair value	$ 52.49
Two Thousand Two Stock Incentive Plan [Member] \| Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and available under long-term incentive plan				707,273
Two Thousand Seventeen Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant		1,252,112
Non-employee Directors [Member] \| Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		1 year
Employees [Member] \| Time Based Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years
Employees [Member] \| Time Based Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		5 years
Employees [Member] \| Performance Shares [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	3 years
Restricted stock grants	75,288
Employees [Member] \| Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years
Restricted stock grants		76,500
Restricted stock grants, Weighted average grant date fair value		$ 37.20
Employees [Member] \| Restricted Stock [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants	283,498
Employees [Member] \| Restricted Stock [Member] \| Minimum [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	3 years
Employees [Member] \| Restricted Stock [Member] \| Maximum [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	5 years
Employees [Member] \| Time Based Shares \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants	208,210
Outside Directors [Member] \| Restricted Stock [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	1 year
Restricted stock grants	22,866