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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 88,396  
Due after one year through five years 654,617  
Due after five years through ten years 431,416  
Due after ten years 31,123  
Perpetual maturity securities 3,502  
Amortized Cost 1,209,054 $ 1,162,919
Fair Value    
Due in one year or less 87,092  
Due after one year through five years 616,104  
Due after five years through ten years 373,897  
Due after ten years 26,718  
Perpetual maturity securities 3,247  
Fair Value $ 1,107,058 $ 1,064,330