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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | $ 510,011 | $ 453,042
Less than 12 months, Gross Unrealized Losses |  | (8,194) | (5,160)
12 months or longer, Fair Value | [1] | 36,136 | 115,363
12 months or longer, Gross Unrealized Losses | [1] | (340) | (1,739)
Total, Fair Value |  | 546,147 | 568,405
Total, Gross Unrealized Losses |  | (8,534) | (6,899)
Obligations of States and Political Subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (670) |
Mortgage Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (159) |
Asset-backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
12 months or longer, Gross Unrealized Losses |  | (28) |
Total, Gross Unrealized Losses |  | (616) |
Commercial Mortgage-Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (827) |
Corporate bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (1,072) |
Foreign Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (231) |
Common Shares |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 38,128 | 20,002
Less than 12 months, Gross Unrealized Losses |  | (4,950) | (2,808)
12 months or longer, Fair Value | [1] |  | 1,577
12 months or longer, Gross Unrealized Losses | [1] |  | (130)
Total, Fair Value |  | 38,128 | 21,579
Total, Gross Unrealized Losses |  | (4,950) | (2,938)
Fixed Maturities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 471,883 | 433,040
Less than 12 months, Gross Unrealized Losses |  | (3,244) | (2,352)
12 months or longer, Fair Value | [1] | 36,136 | 113,786
12 months or longer, Gross Unrealized Losses | [1] | (340) | (1,609)
Total, Fair Value |  | 508,019 | 546,826
Total, Gross Unrealized Losses |  | (3,584) | (3,961)
Fixed Maturities | U.S. Treasury and Agency Obligations |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  |  | 11,728
Less than 12 months, Gross Unrealized Losses |  |  | (9)
12 months or longer, Fair Value | [1] | 3,413 | 3,343
12 months or longer, Gross Unrealized Losses | [1] | (9) | (74)
Total, Fair Value |  | 3,413 | 15,071
Total, Gross Unrealized Losses |  | (9) | (83)
Fixed Maturities | Obligations of States and Political Subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 43,194 | 28,684
Less than 12 months, Gross Unrealized Losses |  | (573) | (314)
12 months or longer, Fair Value | [1] | 9,510 | 28,061
12 months or longer, Gross Unrealized Losses | [1] | (97) | (383)
Total, Fair Value |  | 52,704 | 56,745
Total, Gross Unrealized Losses |  | (670) | (697)
Fixed Maturities | Mortgage Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 23,004 | 2,818
Less than 12 months, Gross Unrealized Losses |  | (114) | (7)
12 months or longer, Fair Value | [1] | 255 | 51,203
12 months or longer, Gross Unrealized Losses | [1] | (45) | (757)
Total, Fair Value |  | 23,259 | 54,021
Total, Gross Unrealized Losses |  | (159) | (764)
Fixed Maturities | Asset-backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 107,361 | 92,123
Less than 12 months, Gross Unrealized Losses |  | (588) | (283)
12 months or longer, Fair Value | [1] | 4,531 | 1,683
12 months or longer, Gross Unrealized Losses | [1] | (28) | (20)
Total, Fair Value |  | 111,892 | 93,806
Total, Gross Unrealized Losses |  | (616) | (303)
Fixed Maturities | Commercial Mortgage-Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 110,702 | 92,664
Less than 12 months, Gross Unrealized Losses |  | (687) | (525)
12 months or longer, Fair Value | [1] | 15,453 | 26,280
12 months or longer, Gross Unrealized Losses | [1] | (140) | (322)
Total, Fair Value |  | 126,155 | 118,944
Total, Gross Unrealized Losses |  | (827) | (847)
Fixed Maturities | Corporate bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 145,181 | 144,505
Less than 12 months, Gross Unrealized Losses |  | (1,051) | (656)
12 months or longer, Fair Value | [1] | 2,974 | 3,216
12 months or longer, Gross Unrealized Losses | [1] | (21) | (53)
Total, Fair Value |  | 148,155 | 147,721
Total, Gross Unrealized Losses |  | (1,072) | (709)
Fixed Maturities | Foreign Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Less than 12 months, Fair Value |  | 42,441 | 60,518
Less than 12 months, Gross Unrealized Losses |  | (231) | (558)
Total, Fair Value |  | 42,441 | 60,518
Total, Gross Unrealized Losses |  | $ (231) | $ (558)
[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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