v3.26.1
Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 16, 2025
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Dec. 06, 2025
Debt Instrument [Line Items]            
Interest expense     $ 5,800,000 $ 12,000,000.0    
Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Line of credit         $ 0  
Capital Account Notes | AT Umbrella LLC            
Debt Instrument [Line Items]            
Aggregate principal amount $ 187,800,000          
Capital Account Notes | AT Umbrella LLC | Minimum            
Debt Instrument [Line Items]            
Interest rate 6.31%          
Debt instrument, term 2 years          
Capital Account Notes | AT Umbrella LLC | Maximum            
Debt Instrument [Line Items]            
Interest rate 7.50%          
Debt instrument, term 7 years          
Capital Account Notes | Notes Payable | AT Umbrella LLC            
Debt Instrument [Line Items]            
Aggregate principal amount $ 187,800,000          
Capital Account Notes | Notes Payable | AT Umbrella LLC | Minimum            
Debt Instrument [Line Items]            
Debt instrument, amortization period 2 years          
Interest rate 6.31%          
Capital Account Notes | Notes Payable | AT Umbrella LLC | Maximum            
Debt Instrument [Line Items]            
Debt instrument, amortization period 7 years          
Interest rate 7.50%          
Holdover Note | AT Umbrella LLC            
Debt Instrument [Line Items]            
Aggregate principal amount $ 162,300,000          
Interest rate 7.63%          
Debt instrument, term 8 years          
Holdover Note | Notes Payable | AT Umbrella LLC            
Debt Instrument [Line Items]            
Aggregate principal amount $ 162,300,000          
Interest rate           7.63%
Post-service obligation payment period 7 years          
Debt instrument, term 8 years          
Revolving Credit Facility | Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility         20,000,000.0  
Cash borrowings         0  
Revolving Credit Facility | New Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility   $ 50,000,000.0 50,000,000.0 50,000,000.0    
Percent of accounts receivable, reduced by certain reserves   85.00%        
Letter of Credit | Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility   $ 5,000,000.0 5,000,000.0 5,000,000.0    
Standby Letters of Credit | Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Outstanding amount   $ 1,300,000 1,300,000 1,300,000 $ 1,300,000  
Cash borrowings       $ 0    
Floor interest rate (as percent)       1.75%    
Commitment fee (as percent)       0.25%    
Commitment fee     $ 0 $ 0