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Summary of Securities with Gross Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | $ 454,562 |  | $ 347,857 |
Less than 12 months, Gross Unrealized Losses | (4,522) |  | (7,318) |
12 months or longer, Fair Value | 142,146 | [1] | 10,443 | [1]
12 months or longer, Gross Unrealized Losses | (2,665) | [1] | (260) | [1]
Total, Fair Value | 596,708 |  | 358,300 |
Total, Gross Unrealized Losses | (7,187) |  | (7,578) |
U.S. Treasury and Agency Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross Unrealized Losses | (122) |  |  |
Obligations of States and Political Subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross Unrealized Losses | (1,174) |  |  |
Mortgage Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross Unrealized Losses | (1,518) |  |  |
Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross Unrealized Losses | (419) |  |  |
Commercial Mortgage-Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross Unrealized Losses | (673) |  |  |
Corporate bonds and loans |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross Unrealized Losses | (579) |  |  |
Common Shares |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 21,034 |  | 18,622 |
Less than 12 months, Gross Unrealized Losses | (1,714) |  | (627) |
12 months or longer, Fair Value | 1,710 | [1] | 140 | [1]
12 months or longer, Gross Unrealized Losses | (52) | [1] | (9) | [1]
Total, Fair Value | 22,744 |  | 18,762 |
Total, Gross Unrealized Losses | (1,766) |  | (636) |
Other Invested Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 17,690 |  |  |
Less than 12 months, Gross Unrealized Losses | (719) |  |  |
Total, Fair Value | 17,690 |  |  |
Total, Gross Unrealized Losses | (719) |  |  |
Fixed Maturities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 415,838 |  | 329,235 |
Less than 12 months, Gross Unrealized Losses | (2,089) |  | (6,691) |
12 months or longer, Fair Value | 140,436 | [1] | 10,303 | [1]
12 months or longer, Gross Unrealized Losses | (2,613) | [1] | (251) | [1]
Total, Fair Value | 556,274 |  | 339,538 |
Total, Gross Unrealized Losses | (4,702) |  | (6,942) |
Fixed Maturities | U.S. Treasury and Agency Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 19,473 |  | 9,335 |
Less than 12 months, Gross Unrealized Losses | (13) |  | (166) |
12 months or longer, Fair Value | 3,305 | [1] |  |
12 months or longer, Gross Unrealized Losses | (109) | [1] |  |
Total, Fair Value | 22,778 |  | 9,335 |
Total, Gross Unrealized Losses | (122) |  | (166) |
Fixed Maturities | Obligations of States and Political Subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 41,333 |  | 61,401 |
Less than 12 months, Gross Unrealized Losses | (454) |  | (2,000) |
12 months or longer, Fair Value | 32,879 | [1] | 9,922 | [1]
12 months or longer, Gross Unrealized Losses | (720) | [1] | (241) | [1]
Total, Fair Value | 74,212 |  | 71,323 |
Total, Gross Unrealized Losses | (1,174) |  | (2,241) |
Fixed Maturities | Mortgage Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 38,619 |  | 110,304 |
Less than 12 months, Gross Unrealized Losses | (211) |  | (2,859) |
12 months or longer, Fair Value | 70,667 | [1] | 2 | [1]
12 months or longer, Gross Unrealized Losses | (1,307) | [1] |  |
Total, Fair Value | 109,286 |  | 110,306 |
Total, Gross Unrealized Losses | (1,518) |  | (2,859) |
Fixed Maturities | Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 93,919 |  | 42,247 |
Less than 12 months, Gross Unrealized Losses | (384) |  | (228) |
12 months or longer, Fair Value | 3,640 | [1] | 3 | [1]
12 months or longer, Gross Unrealized Losses | (35) | [1] |  |
Total, Fair Value | 97,559 |  | 42,250 |
Total, Gross Unrealized Losses | (419) |  | (228) |
Fixed Maturities | Commercial Mortgage-Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 64,435 |  | 45,642 |
Less than 12 months, Gross Unrealized Losses | (291) |  | (856) |
12 months or longer, Fair Value | 26,736 | [1] |  |
12 months or longer, Gross Unrealized Losses | (382) | [1] |  |
Total, Fair Value | 91,171 |  | 45,642 |
Total, Gross Unrealized Losses | (673) |  | (856) |
Fixed Maturities | Corporate bonds and loans |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 108,325 |  | 60,306 |
Less than 12 months, Gross Unrealized Losses | (519) |  | (582) |
12 months or longer, Fair Value | 3,209 | [1] | 376 | [1]
12 months or longer, Gross Unrealized Losses | (60) | [1] | (10) | [1]
Total, Fair Value | 111,534 |  | 60,682 |
Total, Gross Unrealized Losses | (579) |  | (592) |
Fixed Maturities | Foreign Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Less than 12 months, Fair Value | 49,734 |  |  |
Less than 12 months, Gross Unrealized Losses | (217) |  |  |
Total, Fair Value | 49,734 |  |  |
Total, Gross Unrealized Losses | $ (217) |  |  |
[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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