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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax [Line Items]      
Pretax income $ 201,440,000 $ 192,121,000 $ 134,269,000
Recognition of an excess tax benefit and deficiency $ 900,000    
Favorable discrete adjustment   $ 4,500,000  
Effective tax rate impact associated with subsidiary worthless stock   2.40%  
Effective tax rate reflects to establishment of full valuation allowance with combined state net operating losses     1,400,000
Expected non-deductibility of reductions in carrying value of equity investment     $ 900,000
Increased in effective rate due to establishment full valuation allowance and non-deductibility of reductions     1.70%
Effective tax rate impact associated with stock-based compensation (0.40%) (0.10%) 0.60%
Unrecognized tax benefits that would impact effective tax rate $ 27,400,000 $ 22,900,000  
Short-term reserves 2,200,000    
Long-term reserves 28,100,000    
Interest and penalties $ 4,400,000 3,300,000  
Significant change in unrecognized tax benefits, nature of event description Due to the expiration of various statutes of limitations    
Gross unrecognized tax benefits change range, minimum $ 0    
Gross unrecognized tax benefits change range, maximum 3,100,000    
Deferred tax asset, gross 373,000,000 151,700,000  
Deferred tax liability, gross 79,100,000 38,800,000  
Tax amortization 33,148,000    
Federal Tax Authority [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards 3,900,000    
Federal Tax Authority [Member] | USAHS [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards 16,200,000    
Interest expense disallowance carryforward 18,100,000    
Deferred tax amortizable intangible assets 202,300,000    
State [Member]      
Income Tax [Line Items]      
Deferred tax assets, valuation allowance 12,000,000 14,000,000  
Net operating loss carry forwards 222,100,000    
Decrease in valuation allowance   2,100,000  
State [Member] | USAHS [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards 7,700,000    
Federal and State [Member] | USAHS [Member]      
Income Tax [Line Items]      
Interest expense disallowance carryforward 0    
Tax amortization 800,000    
Combined State [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards 128,300,000    
Separate State [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards 51,800,000    
Maximum [Member]      
Income Tax [Line Items]      
Unrecognized tax benefit, income tax penalties and interest benefit (expense) recognized $ 1,000,000 $ 700,000 $ 400,000
Maximum [Member] | State [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards, expiration year 2037    
Minimum [Member] | State [Member]      
Income Tax [Line Items]      
Net operating loss carry forwards, expiration year 2024    
Capital Loss Carryforward      
Income Tax [Line Items]      
Deferred tax assets, valuation allowance     $ 3,100,000
Effective income tax rate reconciliation, tax settlement, percent     2.30%