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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 3,155,980        
All outstanding liabilities before 2019, net of reinsurance 14,586        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 308,859        
Accident Year 2019          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 499,468 $ 480,967 $ 463,924 $ 446,997 $ 335,991
Accident Year 2020          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 734,607 645,553 604,201 $ 452,560  
Accident Year 2021          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 725,118 665,008 $ 461,709    
Accident Year 2022          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 736,066 $ 518,829      
Accident Year 2023          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 460,721