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Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 509,231                  
Commercial Lines Segment | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 139,434                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 36,575                  
Commercial Lines Segment | Property Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 7,635                  
Commercial Lines Segment | Property Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 58,926 $ 57,653 $ 41,942              
Commercial Lines Segment | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 51,967 39,643                
Commercial Lines Segment | Property Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 28,541                  
Commercial Lines Segment | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 506,257                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 281,081                  
Commercial Lines Segment | Casualty Insurance | All outstanding liabilities before 2008, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 64,830                  
Commercial Lines Segment | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 25,147 14,584 3,336              
Commercial Lines Segment | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 14,027 4,135                
Commercial Lines Segment | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 4,914                  
Commercial Lines Segment | Casualty Insurance | Accident Year 2008                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,254 117,797 116,246 $ 114,546 $ 110,145 $ 100,369 $ 86,889 $ 65,700 $ 34,172 $ 7,844
Commercial Lines Segment | Casualty Insurance | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 79,896 77,771 75,181 71,108 65,721 53,738 37,653 19,154 5,564  
Commercial Lines Segment | Casualty Insurance | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 69,615 67,277 65,377 58,913 50,520 34,659 19,926 5,503    
Commercial Lines Segment | Casualty Insurance | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 74,839 72,087 64,722 56,562 41,282 21,325 5,451      
Commercial Lines Segment | Casualty Insurance | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 39,596 36,360 31,231 22,456 11,884 3,500        
Commercial Lines Segment | Casualty Insurance | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 46,272 38,438 29,510 17,881 6,400          
Commercial Lines Segment | Casualty Insurance | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 33,697 26,268 15,690 3,968            
Personal Lines | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 252,649                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 44,360                  
Personal Lines | Property Insurance | All outstanding liabilities before 2016, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 4,206                  
Personal Lines | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 138,289 121,899                
Personal Lines | Property Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 114,360                  
Personal Lines | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 21,943                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 52,651                  
Personal Lines | Casualty Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 11,672                  
Personal Lines | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 12,926 8,757 3,439              
Personal Lines | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 6,885 3,507                
Personal Lines | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,132                  
Reinsurance Operations | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 61,741                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 70,492                  
Reinsurance Operations | Property Insurance | All outstanding liabilities before 2011, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 322                  
Reinsurance Operations | Property Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 6,768 5,163 742              
Reinsurance Operations | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,704 2,071                
Reinsurance Operations | Property Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,152                  
Reinsurance Operations | Property Insurance | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 23,096 22,771 22,426 22,060 20,698 19,274 12,044      
Reinsurance Operations | Property Insurance | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 7,584 7,527 7,648 7,221 5,481 1,127        
Reinsurance Operations | Property Insurance | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,255 5,111 5,835 4,008 723          
Reinsurance Operations | Property Insurance | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 11,182 10,460 9,035 2,243            
Reinsurance Operations | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 153,005                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 24,072                  
Reinsurance Operations | Casualty Insurance | All outstanding liabilities before 2008, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 1,210                  
Reinsurance Operations | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1 128 107              
Reinsurance Operations | Casualty Insurance | Accident Year 2008                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 8,981 8,919 8,875 8,713 6,832 5,648 5,149 1,955 627  
Reinsurance Operations | Casualty Insurance | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 31,128 31,019 30,141 15,104 13,652 12,597 11,064 9,759 $ 1,986  
Reinsurance Operations | Casualty Insurance | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 56,960 55,848 55,315 39,123 36,090 30,754 21,447 $ 10,185    
Reinsurance Operations | Casualty Insurance | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 40,079 39,815 38,907 36,020 28,495 20,072 $ 7,968      
Reinsurance Operations | Casualty Insurance | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 15,790 15,696 15,534 11,658 9,435 $ 5,312        
Reinsurance Operations | Casualty Insurance | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 65 65 62 50 $ 123          
Reinsurance Operations | Casualty Insurance | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1 $ 50 $ 47 $ 88