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Liability for Losses and Loss Expenses - Summary of Cumulative Claim Frequency and Total of Incurred but not Reported Claims plus Expected Development on Reported Claims Incurred (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Personal Automobile [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,347,094                  
All outstanding liabilities before 2009, net of reinsurance 719                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 122,094                  
Personal Automobile [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,119 $ 118,093 $ 118,054 $ 117,978 $ 117,812 $ 116,748 $ 113,243 $ 107,662 $ 96,749 $ 75,889
Personal Automobile [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 132,835 132,777 132,714 132,479 131,319 127,545 121,621 110,249 87,191  
Personal Automobile [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 136,137 135,132 134,581 133,428 130,862 124,652 111,941 87,517    
Personal Automobile [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 131,642 131,326 130,026 125,946 120,118 109,051 84,241      
Personal Automobile [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 124,926 123,815 120,491 114,893 104,736 85,377        
Personal Automobile [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 139,121 135,027 128,395 116,303 93,611          
Personal Automobile [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 151,159 143,321 129,507 102,433            
Personal Automobile [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 159,879 142,372 111,964              
Personal Automobile [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 150,175 115,585                
Personal Automobile [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 103,101                  
Homeowners [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 635,976                  
All outstanding liabilities before 2009, net of reinsurance 30                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 20,762                  
Homeowners [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 60,557 60,540 60,525 60,501 60,486 60,239 59,875 59,283 57,334 47,419
Homeowners [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 70,692 70,692 70,648 70,626 70,541 70,351 70,125 69,345 57,588  
Homeowners [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 54,557 54,557 54,356 54,317 54,298 54,028 53,619 46,566    
Homeowners [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 50,967 50,902 51,043 50,478 50,210 49,410 40,949      
Homeowners [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 57,243 56,995 57,195 56,990 56,255 45,823        
Homeowners [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 62,844 62,590 62,204 61,542 51,885          
Homeowners [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 63,144 62,760 61,145 50,125            
Homeowners [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 78,006 77,663 67,077              
Homeowners [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 79,892 70,385                
Homeowners [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 58,074                  
Commercial Automobile [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 410,219                  
All outstanding liabilities before 2009, net of reinsurance 47                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 118,372                  
Commercial Automobile [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 21,559 21,558 21,549 21,482 21,014 20,804 19,030 16,426 14,180 10,778
Commercial Automobile [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 29,474 29,102 28,836 28,758 28,014 26,973 24,267 19,106 13,876  
Commercial Automobile [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 31,228 31,104 30,402 29,873 27,417 23,718 20,240 13,642    
Commercial Automobile [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 36,106 36,004 34,083 31,053 26,879 23,557 16,306      
Commercial Automobile [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 48,418 47,290 44,374 39,436 31,089 22,707        
Commercial Automobile [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 51,605 48,261 41,678 35,342 23,875          
Commercial Automobile [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 57,237 48,837 38,237 27,033            
Commercial Automobile [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 49,703 40,213 28,707              
Commercial Automobile [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 47,941 33,862                
Commercial Automobile [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 36,948                  
Commercial MultiPeril [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 390,852                  
All outstanding liabilities before 2009, net of reinsurance 425                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 95,153                  
Commercial MultiPeril [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 29,923 29,721 29,632 28,906 28,681 27,768 26,832 24,749 22,017 17,007
Commercial MultiPeril [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 38,413 38,366 38,240 37,759 36,722 33,526 30,286 24,767 18,773  
Commercial MultiPeril [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 36,329 35,909 35,331 33,327 29,370 26,634 23,384 16,666    
Commercial MultiPeril [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 37,333 36,321 35,104 33,614 29,159 26,216 19,875      
Commercial MultiPeril [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 51,615 50,017 47,021 40,936 35,520 27,920        
Commercial MultiPeril [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 42,849 39,162 34,323 29,419 21,837          
Commercial MultiPeril [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 41,193 34,612 29,402 19,660            
Commercial MultiPeril [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 42,691 36,926 27,399              
Commercial MultiPeril [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 42,296 30,597                
Commercial MultiPeril [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 28,210                  
Workers Compensation [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 346,316                  
All outstanding liabilities before 2009, net of reinsurance 3,261                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 102,035                  
Workers Compensation [Member] | 2010 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 26,301 26,295 26,050 25,804 25,337 24,539 23,137 21,176 15,937 $ 8,066
Workers Compensation [Member] | 2011 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 34,109 33,963 33,577 33,067 32,394 31,905 27,517 21,450 $ 9,157  
Workers Compensation [Member] | 2012 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 34,622 34,460 34,177 33,196 31,244 28,812 22,963 $ 11,097    
Workers Compensation [Member] | 2013 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 40,361 39,617 38,877 36,351 32,783 26,043 $ 13,052      
Workers Compensation [Member] | 2014 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 43,866 42,465 40,393 36,284 28,513 $ 13,932        
Workers Compensation [Member] | 2015 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 37,936 36,929 34,192 27,531 $ 13,071          
Workers Compensation [Member] | 2016 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 40,570 37,178 30,344 $ 14,709            
Workers Compensation [Member] | 2017 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 39,684 31,990 $ 15,581              
Workers Compensation [Member] | 2018 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 31,928 $ 17,644                
Workers Compensation [Member] | 2019 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 16,939