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Schedule of Amortized Cost and Estimated Fair Value of Investments (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] |  |  |  |
Amortized Cost | $ 1,414,602 |  | $ 1,382,175 |
Gross Unrealized Gains | 43,210 |  | 87,326 |
Gross Unrealized Losses | (7,187) |  | (7,578) |
Estimated Fair Value | 1,450,625 |  | 1,461,923 |
Other than temporary impairments recognized in AOCI | (19) | [1] | (24) | [1]
Common Shares |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 96,084 |  | 191,425 |
Gross Unrealized Gains | 26,418 |  | 63,281 |
Gross Unrealized Losses | (1,766) |  | (636) |
Estimated Fair Value | 120,736 |  | 254,070 |
Other Invested Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 21,528 |  | 3,065 |
Gross Unrealized Gains | 309 |  | 424 |
Gross Unrealized Losses | (719) |  |  |
Estimated Fair Value | 21,118 |  | 3,489 |
Fixed Maturities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,296,990 |  | 1,187,685 |
Gross Unrealized Gains | 16,483 |  | 23,621 |
Gross Unrealized Losses | (4,702) |  | (6,942) |
Estimated Fair Value | 1,308,771 |  | 1,204,364 |
Other than temporary impairments recognized in AOCI | (19) | [1] | (24) | [1]
Fixed Maturities | U.S. Treasury and Agency Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 105,577 |  | 78,510 |
Gross Unrealized Gains | 2,506 |  | 3,330 |
Gross Unrealized Losses | (122) |  | (166) |
Estimated Fair Value | 107,961 |  | 81,674 |
Fixed Maturities | Obligations of States and Political Subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 193,602 |  | 178,705 |
Gross Unrealized Gains | 4,018 |  | 4,472 |
Gross Unrealized Losses | (1,174) |  | (2,241) |
Estimated Fair Value | 196,446 |  | 180,936 |
Fixed Maturities | Mortgage Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 220,398 |  | 228,550 |
Gross Unrealized Gains | 3,697 |  | 4,219 |
Gross Unrealized Losses | (1,518) |  | (2,859) |
Estimated Fair Value | 222,577 |  | 229,910 |
Other than temporary impairments recognized in AOCI | (4) | [1] | (5) | [1]
Fixed Maturities | Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 172,988 |  | 167,454 |
Gross Unrealized Gains | 738 |  | 1,210 |
Gross Unrealized Losses | (419) |  | (228) |
Estimated Fair Value | 173,307 |  | 168,436 |
Other than temporary impairments recognized in AOCI | (15) | [1] | (19) | [1]
Fixed Maturities | Commercial Mortgage-Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 117,976 |  | 54,822 |
Gross Unrealized Gains | 29 |  | 9 |
Gross Unrealized Losses | (673) |  | (856) |
Estimated Fair Value | 117,332 |  | 53,975 |
Fixed Maturities | Corporate bonds and loans |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 380,421 |  | 426,872 |
Gross Unrealized Gains | 4,703 |  | 9,112 |
Gross Unrealized Losses | (579) |  | (592) |
Estimated Fair Value | 384,545 |  | 435,392 |
Fixed Maturities | Foreign Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 106,028 |  | 52,772 |
Gross Unrealized Gains | 792 |  | 1,269 |
Gross Unrealized Losses | (217) |  |  |
Estimated Fair Value | $ 106,603 |  | $ 54,041 |
[1] | Represents the total amount of other than temporary impairment losses relating to factors other than credit losses recognized in accumulated other comprehensive income ("AOCI").

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