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Stockholders' Equity - (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
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	900,000		900,000
Equity-based compensation expense	$ 3.5	$ 4.0	$ 7.0	$ 9.6
Payment, Tax Withholding, Share-based Payment Arrangement	0.1	$ 0.0	4.7	$ 2.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 14.6		$ 14.6
Weighted Average Number of Shares Outstanding, Basic	16,682,000	16,754,000	16,800,000	16,777,000
Weighted Average Number of Shares Outstanding, Diluted	16,895,000	17,093,000	17,051,000	17,085,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			216,379
Grant-date fair value of awards per share			$ 37.66
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	120,000	197,000	139,000	181,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			196,451
Grant-date fair value of awards per share			$ 40.47
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	94,000	137,000	112,000	127,000
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	6,000	0	0

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