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Stockholders' Equity - (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,100,000		1,100,000
Stock-based compensation expense	$ 3.8	$ 2.5	$ 6.9	$ 7.3
Share-based Payment Arrangement, Expense, Tax Benefit	1.0	0.6	1.8	1.9
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised			1.2	0.7
Payment, Tax Withholding, Share-based Payment Arrangement	$ 0.0	$ 0.0	$ 1.7	$ 0.7
Weighted Average Number of Shares Outstanding, Diluted	16,971,000	16,783,000	16,689,000	16,689,000
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 14.1		$ 14.1
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			179,528
Grant-date fair value of awards per share			$ 35.68
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	186,000	188,000	0	107,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			68,070
Grant-date fair value of awards per share			$ 39.79
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	98,000	0	0	0

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