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Investments - Additional Information (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses $ 7,187,000 $ 7,578,000
Gross unrealized losses 12 months or greater 2,665,000 [1] 260,000 [1]
Gross unrealized losses less than 12 months 4,522,000 7,318,000
Investments in insurance enhanced municipal bonds 14,619,000  
Ratings without insurance 3,558,000  
Insurance enhanced asset-backed and credit securities as a percentage of total cash and invested assets 1.30%  
Investments in insurance enhanced asset backed and credit securities 19,600,000  
A+ Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced municipal bonds 14,600,000  
Insurance enhanced municipal bonds as a percentage of total cash and invested assets 1.00%  
Insurance enhanced municipal bonds 12,700,000  
Maximum
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in a single issuer as a percentage of shareholders' equity 4.00% 4.00%
Financial Guarantors
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced municipal bonds 12,903,000  
Pre-Refunded Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced municipal bonds 1,859,000  
Pre-Refunded Securities | Financial Guarantors
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced municipal bonds 143,000  
A Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Ratings without insurance 2,300,000  
AA Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Ratings without insurance 1,258,000  
Municipal Bond Insurance Association
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced asset backed and credit securities 11,300,000  
Ambac Financial Group
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced asset backed and credit securities 1,000,000  
Assured Guaranty Corporation
    
Schedule of Available-for-sale Securities [Line Items]    
Investments in insurance enhanced asset backed and credit securities 7,300,000  
U.S. Treasury and Agency Obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 122,000  
U.S. Treasury and Agency Obligations | AA+ Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 12 months or greater 109,000  
Obligations of States and Political Subdivisions
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 1,174,000  
Obligations of States and Political Subdivisions | A- Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 12 months or greater 720,000  
Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 1,518,000  
Mortgage Backed Securities | AA+ Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 12 months or greater 1,307,000  
Asset-backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 419,000  
Weighted average credit enhancement 19.60%  
Asset-backed Securities | A Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 12 months or greater 35,000  
Corporate bonds and loans
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 579,000  
Corporate bonds and loans | A+ Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 12 months or greater 60,000  
Foreign Corporate Bonds | A- Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses less than 12 months 217,000  
Common Shares
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 1,766,000 636,000
Gross unrealized losses 12 months or greater 52,000 [1] 9,000 [1]
Gross unrealized losses less than 12 months 1,714,000 627,000
Other Invested Assets
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 719,000  
Gross unrealized losses less than 12 months 719,000  
Commercial Mortgage-Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 673,000  
Weighted average credit enhancement 33.30%  
Commercial Mortgage-Backed Securities | AA Rating
    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized losses 12 months or greater $ 382,000  
[1] Fixed maturities in a gross unrealized loss position for twelve months or longer are primarily comprised of non-credit losses on investment grade securities where management does not intend to sell, and it is more likely than not that the Company will not be forced to sell the security before recovery. The Company has analyzed these securities and has determined that they are not other than temporarily impaired.