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Investments - Additional Information (Detail) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
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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.

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