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v3.23.3

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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