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Investments - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | $ 8,534 | $ 6,899
Gross unrealized losses for 12 months or greater | [1] | 340 | $ 1,739
Investments in insurance enhanced asset backed and credit securities |  | 45,500 |
Investments in insurance enhanced municipal bonds |  | 19,005 |
Ratings without insurance |  | 511 |
Investments in asset backed and taxable municipal bonds |  | $ 26,500 |
Asset backed and taxable municipal bonds as a percentage of total cash and invested assets |  | 1.40% |
Municipal Bond Insurance Association |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in asset backed and taxable municipal bonds |  | $ 8,400 |
Ambac Financial Group |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in asset backed and taxable municipal bonds |  | 1,400 |
Assured Guaranty Corporation |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in asset backed and taxable municipal bonds |  | 14,500 |
Financial Guaranty Insurance Group |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in asset backed and taxable municipal bonds |  | 200 |
Build America Mutual |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in asset backed and taxable municipal bonds |  | 2,000 |
Financial Guarantors |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in insurance enhanced municipal bonds |  | $ 10,820 |
Maximum |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in a single issuer as a percentage of shareholders' equity |  | 4.00% | 4.00%
Pre-Refunded Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in insurance enhanced municipal bonds |  | $ 8,321 |
Pre-Refunded Securities | Financial Guarantors |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in insurance enhanced municipal bonds |  | 136 |
A+ Rating |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments in insurance enhanced municipal bonds |  | $ 19,000 |
Insurance enhanced municipal bonds as a percentage of total cash and invested assets |  | 0.01% |
Insurance enhanced municipal bonds |  | $ 10,700 |
Obligations of States and Political Subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | 670 |
Obligations of States and Political Subdivisions | A Rating |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses for 12 months or greater |  | 97 |
Corporate bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | 1,072 |
Corporate bonds | BBB Rating |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses for 12 months or greater |  | 21 |
Common Shares |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | 4,950 | $ 2,938
Gross unrealized losses for 12 months or greater | [1] |  | $ 130
U.S. Treasury and Agency Obligations | AA+ Rating |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | 9 |
Mortgage Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | 159 |
Mortgage Backed Securities | Standard & Poor's, CC Rating |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses for 12 months or greater |  | 45 |
Asset-backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | 616 |
Gross unrealized losses for 12 months or greater |  | $ 28 |
Weighted average credit enhancement |  | 21.90% |
Commercial Mortgage-Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | $ 827 |
Weighted average credit enhancement |  | 35.70% |
Percentage of securities in unrealized loss for months position rated |  | 81.00% |
Commercial Mortgage-Backed Securities | AA- Rating |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses for 12 months or greater |  | $ 140 |
Foreign Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized losses |  | $ 231 |
[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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