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Fair value of financial instruments - Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Assets    
Investments in equity securities $ 35,746 $ 40,566
Fair Value, Measurements, Recurring    
Assets    
Investments in equity securities 35,746  
Liabilities    
Contingent earn-out obligations 10,384  
Temporary equity    
Noncontrolling interests subject to put provisions 1,666,521  
Fair Value, Measurements, Recurring | Interest rate cap agreements    
Assets    
Interest rate cap agreements 21,894  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Investments in equity securities 35,746  
Liabilities    
Contingent earn-out obligations  
Temporary equity    
Noncontrolling interests subject to put provisions  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Interest rate cap agreements    
Assets    
Interest rate cap agreements  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Investments in equity securities  
Liabilities    
Contingent earn-out obligations  
Temporary equity    
Noncontrolling interests subject to put provisions  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Interest rate cap agreements    
Assets    
Interest rate cap agreements 21,894  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Investments in equity securities  
Liabilities    
Contingent earn-out obligations 10,384  
Temporary equity    
Noncontrolling interests subject to put provisions 1,666,521  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate cap agreements    
Assets    
Interest rate cap agreements