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Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) - USD ($)
$ in Thousands
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
Dec. 31, 2007
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 490,558                  
Commercial Lines Segment | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 159,213                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 41,052                  
Commercial Lines Segment | Property Insurance | All outstanding liabilities before 2014, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 5,378                  
Commercial Lines Segment | Property Insurance | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 61,085 $ 59,049 $ 45,771              
Commercial Lines Segment | Property Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 58,134 41,972                
Commercial Lines Segment | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 39,994                  
Commercial Lines Segment | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 640,791                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 311,274                  
Commercial Lines Segment | Casualty Insurance | All outstanding liabilities before 2007, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 62,487                  
Commercial Lines Segment | Casualty Insurance | Accident Year 2007                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 191,564 190,102 188,162 $ 184,028 $ 174,488 $ 160,712 $ 136,203 $ 96,489 $ 46,819 $ 14,250
Commercial Lines Segment | Casualty Insurance | Accident Year 2008                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 117,639 116,094 114,546 110,145 100,369 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 76,413 73,831 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 66,593 64,693 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 72,247 64,885 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 35,776 30,883 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 37,657 28,955 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 25,133 14,846 3,968              
Commercial Lines Segment | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 13,922 2,958                
Commercial Lines Segment | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,847                  
Personal Lines Segment | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 254,641                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 30,424                  
Personal Lines Segment | Property Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 2,538                  
Personal Lines Segment | Property Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 133,093 109,953                
Personal Lines Segment | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 121,548                  
Personal Lines Segment | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 13,213                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 43,500                  
Personal Lines Segment | Casualty Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 11,338                  
Personal Lines Segment | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 9,418 3,817                
Personal Lines Segment | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,795                  
Reinsurance Operations | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 67,352                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 42,021                  
Reinsurance Operations | Property Insurance | All outstanding liabilities before 2010, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 181                  
Reinsurance Operations | Property Insurance | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 14,249 14,231 14,199 14,043 12,201 11,678 456      
Reinsurance Operations | Property Insurance | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 7,527 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 5,111 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 10,460 9,035 2,243              
Reinsurance Operations | Property Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 2,071                  
Reinsurance Operations | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 154,273                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 22,287                  
Reinsurance Operations | Casualty Insurance | Accident Year 2007                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,733 2,727 2,678 2,674 2,452 1,900 1,811 852 $ 78  
Reinsurance Operations | Casualty Insurance | Accident Year 2008                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 31,019 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 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 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 15,696 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 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 50 47 $ 88              
Reinsurance Operations | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 128 $ 107