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Stockholders' Equity and Share-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended 51 Months Ended
Jan. 31, 2022
May 31, 2021
Feb. 28, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2022
Feb. 29, 2020
Oct. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Preferred shares, Authorized   7,000,000.0   7,000,000 7,000,000     7,000,000    
Preferred shares, voting rights   one vote per share                
Preferred shares, Issued       0 0     0    
Preferred shares, outstanding       0 0     0    
Repurchase of common stock       $ 10,000,000   $ 5,500,000        
Share-based compensation expense recognized       23,108,000 $ 25,606,000 23,119,000        
Unrecognized stock-based compensation expense       $ 33,500,000       $ 33,500,000    
Unrecognized stock-based compensation expense, weighted-average recognition period       1 year 3 months 7 days            
Restricted Stock Units and Deferred Stock Units | Board of Directors                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Share-based compensation expense recognized       $ 1,100,000 $ 1,100,000 $ 0.0        
Amended and Restated 2010 Incentive Plan                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Maximum number of shares to be issued   6,148,613                
Incentive plan and award expiration date         May 13, 2031          
Shares available for future issuance       2,063,234       2,063,234    
Amended and Restated 2010 Incentive Plan | Restricted Stock Units and Deferred Stock Units                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Total fair value of stock units vested       $ 21,500,000            
Amended and Restated 2010 Incentive Plan | Restricted Stock Units (RSUs) | Minimum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Vesting period       0 years            
Amended and Restated 2010 Incentive Plan | Restricted Stock Units (RSUs) | Maximum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Vesting period       5 years            
Amended and Restated 2010 Incentive Plan | Deferred Stock Units                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Conversion of stock, converted to common shares       52,000            
Number of outstanding shares       38,000 91,000     38,000    
Amended and Restated 2010 Incentive Plan | EPS Performance-based Restricted Stock Units | Minimum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares       0.00%            
Amended and Restated 2010 Incentive Plan | EPS Performance-based Restricted Stock Units | Maximum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares       200.00%            
Amended and Restated 2010 Incentive Plan | TSR Performance-based Restricted Stock Units | Minimum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares       0.00%            
Amended and Restated 2010 Incentive Plan | TSR Performance-based Restricted Stock Units | Maximum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares       200.00%            
Amended and Restated 2010 Incentive Plan | Performance Based Restricted Stock Units to ATI Employees | Minimum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares 0.00%                  
Amended and Restated 2010 Incentive Plan | Performance Based Restricted Stock Units to ATI Employees | Maximum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares 100.00%                  
Amended and Restated 2010 Incentive Plan | Operating Cash Flow Performance Based Restricted Stock Units                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares     100.00%              
Amended and Restated 2010 Incentive Plan | Operating Cash Flow Performance Based Restricted Stock Units | Vesting in Four Year                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares     50.00%              
Amended and Restated 2010 Incentive Plan | Operating Cash Flow Performance Based Restricted Stock Units | Vesting in Five Year                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Range of percentage of shares to be issued upon settlement following vesting of target number of shares     50.00%              
Amended and Restated 2010 Incentive Plan | Performance Stock Units                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Total fair value of stock units vested       $ 7,200,000            
Amended and Restated 2010 Incentive Plan | Stock Options                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Vesting period     3 years              
Stock options, Granted     40,000 40,000            
Stock options, Expiration Period     7 years              
Fair value of stock options granted       $ 1,900,000            
2018 Repurchase Plan                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Common stock repurchase program authorized amount                   $ 25,000,000.0
Shares repurchased       80,000   65,000 119,000 264,000    
Repurchase of common stock       $ 9,500,000   $ 5,500,000 $ 10,000,000.0 $ 25,000,000.0    
Shares repurchased, average cost per share       $ 118.97   $ 84.55 $ 83.71 $ 94.57    
2020 Repurchase Plan                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Common stock repurchase program authorized amount                 $ 50,000,000.0  
Shares repurchased       4,000            
Repurchase of common stock       $ 500,000            
Shares repurchased, average cost per share       $ 116.95            
Available for share repurchases       $ 49,500,000       $ 49,500,000