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Stockholders' Equity - (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
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 $ 4.9 $ 0.7 $ 5.5 $ 3.1
Share-based Payment Arrangement, Expense, Tax Benefit 1.2 0.2 1.4 0.8
Payment, Tax Withholding, Share-based Payment Arrangement 1.0 $ 0.1 2.5 $ 1.7
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 18.7   $ 18.7  
Weighted Average Number of Shares Outstanding, Diluted 17,078,000 16,685,000 17,080,000 16,678,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 105,000 0 171,000 0
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share-based awards granted     210,844  
Grant-date fair value of awards per share     $ 29.24  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share-based awards granted     103,067  
Grant-date fair value of awards per share     $ 30.55  
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 125,000 0 120,000 0