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Segment Information - Summary of Premiums Written and Earned by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net $ 926,820 $ 811,898 $ 1,842,741 $ 1,734,471
Direct 972,900 828,800 1,926,300 1,786,700
Private Passenger Automobile Line [Member]        
Segment Reporting Information [Line Items]        
Net 650,800 579,700 1,304,600 1,273,600
Direct 646,000 555,000 1,312,500 1,265,400
Homeowners Line [Member]        
Segment Reporting Information [Line Items]        
Net 169,400 146,500 330,200 286,000
Direct 207,900 180,700 378,100 328,200
Commercial Automobile Line [Member]        
Segment Reporting Information [Line Items]        
Net 64,600 51,100 127,200 106,300
Direct 66,200 55,800 135,100 117,500
Other [Member]        
Segment Reporting Information [Line Items]        
Net 42,000 34,600 80,700 68,600
Direct 52,800 37,300 100,600 75,600
Property and Casualty Lines [Member]        
Segment Reporting Information [Line Items]        
Net 919,515 804,797 1,828,330 1,720,140
Direct 963,418 823,031 1,910,024 1,772,775
Property and Casualty Lines [Member] | Private Passenger Automobile Line [Member]        
Segment Reporting Information [Line Items]        
Net 650,800 579,700 1,304,600 1,273,600
Direct 646,000 555,000 1,312,500 1,265,400
Property and Casualty Lines [Member] | Homeowners Line [Member]        
Segment Reporting Information [Line Items]        
Net 169,400 146,500 330,200 286,000
Direct 207,900 180,700 378,100 328,200
Property and Casualty Lines [Member] | Commercial Automobile Line [Member]        
Segment Reporting Information [Line Items]        
Net 64,600 51,100 127,200 106,300
Direct 66,200 55,800 135,100 117,500
Property and Casualty Lines [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net 34,700 27,500 66,300 54,200
Direct 43,300 31,500 84,300 61,700
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Net 7,300 7,100 14,400 14,400
Direct 9,500 5,800 16,300 13,900
Other Segments [Member] | Private Passenger Automobile Line [Member]        
Segment Reporting Information [Line Items]        
Net 0 0 0 0
Direct 0 0 0 0
Other Segments [Member] | Homeowners Line [Member]        
Segment Reporting Information [Line Items]        
Net 0 0 0 0
Direct 0 0 0 0
Other Segments [Member] | Commercial Automobile Line [Member]        
Segment Reporting Information [Line Items]        
Net 0 0 0 0
Direct 0 0 0 0
Other Segments [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net 7,300 7,100 14,400 14,400
Direct $ 9,500 $ 5,800 $ 16,300 $ 13,900