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Liability for Losses and Loss Expenses - Summary of Incurred and Paid Claims Development, Net of Reinsurance (Detail)
Claims in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Claims
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Personal Automobile [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,468,469                  
Personal Automobile [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,294 $ 118,314 $ 118,289 $ 118,385 $ 118,587 $ 118,916 $ 118,876 $ 118,562 $ 117,552 $ 117,967
Total IBNR Plus Expected Development on Reported Claims $ 27                  
Cumulative Number of Reported Claims | Claims 70                  
Personal Automobile [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 133,207 133,142 133,145 133,218 133,617 133,229 132,987 131,678 127,929  
Total IBNR Plus Expected Development on Reported Claims $ 73                  
Cumulative Number of Reported Claims | Claims 75                  
Personal Automobile [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 136,677 136,141 136,463 136,552 136,493 135,592 133,201 130,415    
Total IBNR Plus Expected Development on Reported Claims $ 215                  
Cumulative Number of Reported Claims | Claims 69                  
Personal Automobile [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 132,853 132,934 132,604 132,643 131,594 130,737 124,965      
Total IBNR Plus Expected Development on Reported Claims $ 175                  
Cumulative Number of Reported Claims | Claims 66                  
Personal Automobile [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 126,734 126,779 126,200 124,210 124,806 124,426        
Total IBNR Plus Expected Development on Reported Claims $ 264                  
Cumulative Number of Reported Claims | Claims 71                  
Personal Automobile [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 142,408 142,493 139,181 139,333 137,596          
Total IBNR Plus Expected Development on Reported Claims $ 732                  
Cumulative Number of Reported Claims | Claims 70                  
Personal Automobile [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 157,943 157,516 153,937 150,216            
Total IBNR Plus Expected Development on Reported Claims $ 2,372                  
Cumulative Number of Reported Claims | Claims 73                  
Personal Automobile [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 175,939 176,728 166,690              
Total IBNR Plus Expected Development on Reported Claims $ 4,884                  
Cumulative Number of Reported Claims | Claims 79                  
Personal Automobile [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 183,358 186,580                
Total IBNR Plus Expected Development on Reported Claims $ 10,675                  
Cumulative Number of Reported Claims | Claims 80                  
Personal Automobile [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 161,056                  
Total IBNR Plus Expected Development on Reported Claims $ 28,339                  
Cumulative Number of Reported Claims | Claims 66                  
Homeowners [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 656,708                  
Homeowners [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 60,641 60,624 60,542 60,443 60,440 60,355 59,972 60,248 60,729 60,315
Cumulative Number of Reported Claims | Claims 25                  
Homeowners [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 70,682 70,642 70,479 70,351 70,297 70,381 70,436 70,461 71,256  
Cumulative Number of Reported Claims | Claims 27                  
Homeowners [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 54,537 54,523 54,381 54,281 54,351 54,468 54,794 53,962    
Cumulative Number of Reported Claims | Claims 19                  
Homeowners [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 51,008 50,971 50,988 50,874 51,122 51,121 50,887      
Cumulative Number of Reported Claims | Claims 13                  
Homeowners [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 57,402 57,288 57,332 57,680 58,378 56,916        
Total IBNR Plus Expected Development on Reported Claims $ (4)                  
Cumulative Number of Reported Claims | Claims 18                  
Homeowners [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 63,099 63,071 63,053 63,925 63,359          
Total IBNR Plus Expected Development on Reported Claims $ 45                  
Cumulative Number of Reported Claims | Claims 14                  
Homeowners [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 63,355 63,735 64,064 62,443            
Total IBNR Plus Expected Development on Reported Claims $ 78                  
Cumulative Number of Reported Claims | Claims 13                  
Homeowners [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 79,305 79,911 79,283              
Total IBNR Plus Expected Development on Reported Claims $ 724                  
Cumulative Number of Reported Claims | Claims 18                  
Homeowners [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 83,385 81,965                
Total IBNR Plus Expected Development on Reported Claims $ 1,657                  
Cumulative Number of Reported Claims | Claims 19                  
Homeowners [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 73,294                  
Total IBNR Plus Expected Development on Reported Claims $ 6,775                  
Cumulative Number of Reported Claims | Claims 14                  
Commercial Automobile [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 528,544                  
Commercial Automobile [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 21,768 21,726 21,713 21,746 21,756 21,490 21,477 20,695 19,913 19,315
Total IBNR Plus Expected Development on Reported Claims $ 9                  
Cumulative Number of Reported Claims | Claims 7                  
Commercial Automobile [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 29,542 29,751 29,487 29,107 29,112 28,893 28,570 27,157 26,642  
Total IBNR Plus Expected Development on Reported Claims $ 18                  
Cumulative Number of Reported Claims | Claims 9                  
Commercial Automobile [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 31,896 31,803 31,648 31,278 31,435 30,606 27,720 26,557    
Total IBNR Plus Expected Development on Reported Claims $ 28                  
Cumulative Number of Reported Claims | Claims 8                  
Commercial Automobile [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 36,569 36,435 36,404 35,240 34,751 33,749 32,902      
Total IBNR Plus Expected Development on Reported Claims $ 89                  
Cumulative Number of Reported Claims | Claims 9                  
Commercial Automobile [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 49,168 49,284 48,213 47,326 44,544 42,760        
Total IBNR Plus Expected Development on Reported Claims $ 270                  
Cumulative Number of Reported Claims | Claims 11                  
Commercial Automobile [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 54,517 54,259 51,412 48,323 46,526          
Total IBNR Plus Expected Development on Reported Claims $ 662                  
Cumulative Number of Reported Claims | Claims 12                  
Commercial Automobile [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 67,127 65,905 57,353 54,302            
Total IBNR Plus Expected Development on Reported Claims $ 2,134                  
Cumulative Number of Reported Claims | Claims 13                  
Commercial Automobile [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 67,697 67,927 61,484              
Total IBNR Plus Expected Development on Reported Claims $ 5,149                  
Cumulative Number of Reported Claims | Claims 14                  
Commercial Automobile [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 81,396 79,307                
Total IBNR Plus Expected Development on Reported Claims $ 11,763                  
Cumulative Number of Reported Claims | Claims 15                  
Commercial Automobile [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 88,864                  
Total IBNR Plus Expected Development on Reported Claims $ 27,764                  
Cumulative Number of Reported Claims | Claims 15                  
Commercial MultiPeril [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 485,580                  
Commercial MultiPeril [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 30,105 29,925 29,779 29,463 29,453 29,373 29,169 29,390 29,656 28,745
Cumulative Number of Reported Claims | Claims 6                  
Commercial MultiPeril [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 38,434 38,160 38,105 38,270 37,385 37,576 35,942 35,411 33,054  
Cumulative Number of Reported Claims | Claims 7                  
Commercial MultiPeril [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 36,876 36,525 36,214 35,755 34,117 32,449 30,716 29,789    
Cumulative Number of Reported Claims | Claims 6                  
Commercial MultiPeril [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 37,453 37,365 37,981 37,205 37,292 35,679 35,683      
Total IBNR Plus Expected Development on Reported Claims $ 38                  
Cumulative Number of Reported Claims | Claims 6                  
Commercial MultiPeril [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 53,116 53,294 52,336 51,843 50,135 48,204        
Total IBNR Plus Expected Development on Reported Claims $ 147                  
Cumulative Number of Reported Claims | Claims 7                  
Commercial MultiPeril [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 45,873 45,104 44,728 43,874 42,070          
Total IBNR Plus Expected Development on Reported Claims $ 519                  
Cumulative Number of Reported Claims | Claims 6                  
Commercial MultiPeril [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 48,871 48,267 46,988 43,005            
Total IBNR Plus Expected Development on Reported Claims $ 2,015                  
Cumulative Number of Reported Claims | Claims 6                  
Commercial MultiPeril [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 56,517 56,043 56,185              
Total IBNR Plus Expected Development on Reported Claims $ 4,604                  
Cumulative Number of Reported Claims | Claims 7                  
Commercial MultiPeril [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 66,470 66,265                
Total IBNR Plus Expected Development on Reported Claims $ 10,568                  
Cumulative Number of Reported Claims | Claims 7                  
Commercial MultiPeril [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 71,865                  
Total IBNR Plus Expected Development on Reported Claims $ 21,633                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 445,090                  
Workers Compensation [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 26,829 26,801 26,984 27,037 27,121 26,944 26,637 27,010 27,859 $ 27,304
Total IBNR Plus Expected Development on Reported Claims $ 37                  
Cumulative Number of Reported Claims | Claims 5                  
Workers Compensation [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 35,034 34,926 35,194 35,039 35,670 36,369 36,614 35,757 $ 32,490  
Total IBNR Plus Expected Development on Reported Claims $ 53                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 35,932 35,954 36,468 37,163 37,926 38,827 39,516 $ 39,142    
Total IBNR Plus Expected Development on Reported Claims $ 75                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 42,651 42,555 42,327 42,828 44,289 47,027 $ 46,325      
Total IBNR Plus Expected Development on Reported Claims $ 187                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 47,693 47,540 48,537 49,288 51,553 $ 51,508        
Total IBNR Plus Expected Development on Reported Claims $ 264                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 43,006 44,986 45,991 49,615 $ 53,332          
Total IBNR Plus Expected Development on Reported Claims $ 836                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 44,969 47,883 49,802 $ 58,814            
Total IBNR Plus Expected Development on Reported Claims $ 1,630                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 52,687 56,351 $ 60,450              
Total IBNR Plus Expected Development on Reported Claims $ 3,362                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 55,291 $ 62,197                
Total IBNR Plus Expected Development on Reported Claims $ 7,081                  
Cumulative Number of Reported Claims | Claims 6                  
Workers Compensation [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 60,998                  
Total IBNR Plus Expected Development on Reported Claims $ 19,280                  
Cumulative Number of Reported Claims | Claims 6