Share-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense		$ 8.0	$ 8.7	$ 16.9
Share-based payments expense, net of tax		6.9	$ 7.8	15.5
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, unrecognized compensation costs on non-vested awards		$ 9.6
Employee service share-based compensation, unrecognized compensation costs recognition period		2 years 4 months 24 days
Share-based compensation, restricted shares , vested in period, fair value		$ 6.6
Options outstanding (in shares)		278,430	370,027
Stock-Settled SARs Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised (in shares)		129,977
Share based compensation arrangement by share based payment award options exercises, intrinsic value		$ 2.2
Share based compensation arrangement by share based payment award, shares issued (in shares)		10,178
Share based compensation arrangement by share based payment award, shares outstanding (in shares)		10,178
Share-based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense		$ 0.5	$ 0.7	$ 0.5
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, unrecognized compensation costs on non-vested awards		$ 4.4
Employee service share-based compensation, unrecognized compensation costs recognition period		1 year 8 months 12 days
Share-based compensation, restricted shares , vested in period, fair value		$ 0.4
Options outstanding (in shares)		200,564	157,847
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period, years		3 years
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period, years		4 years
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	1,885,000
Expiration period	10 years
2007 Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period, years		3 months
Discount from market price		85.00%
Earn Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount from market price		85.00%
Earn Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period, years		3 years
Earn Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period, years		5 years