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Stockholders' Equity - (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 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 $ 1.5 $ 4.9 $ 3.4 $ 5.5
Share-based Payment Arrangement, Expense, Tax Benefit 0.4 1.2 0.9 1.4
Payment, Tax Withholding, Share-based Payment Arrangement 0.4 $ 1.0 4.6 $ 2.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 16.8   $ 16.8  
Weighted Average Number of Shares Outstanding, Basic 16,865,000 16,849,000 16,849,000 16,788,000
Weighted Average Number of Shares Outstanding, Diluted 16,958,000 17,078,000 17,003,000 17,080,000
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share-based awards granted     195,127  
Grant-date fair value of awards per share     $ 37.99  
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 91,000 105,000 152,000 171,000
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 2,000 125,000 2,000 120,000