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Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | $ (347) | $ (795)
Fair Value, Less than Twelve Months | 22,319 | 46,186
Gross Unrealized Loss, Twelve Months or Greater | (269) | (253)
Fair Value, Twelve Months or Greater | 1,851 | 1,299
Gross Unrealized Loss, Total | (616) | (1,048)
Fair Value, Total | 24,170 | 47,485
Fixed-Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (145) | (522)
Fair Value, Less than Twelve Months | 12,053 | 35,444
Gross Unrealized Loss, Twelve Months or Greater | (56) | (7)
Fair Value, Twelve Months or Greater | 761 | 230
Gross Unrealized Loss, Total | (201) | (529)
Fair Value, Total | 12,814 | 35,674
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (1) | (22)
Fair Value, Less than Twelve Months | 310 | 3,291
Gross Unrealized Loss, Twelve Months or Greater |  |
Fair Value, Twelve Months or Greater |  |
Gross Unrealized Loss, Total | (1) | (22)
Fair Value, Total | 310 | 3,291
Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (67) | (212)
Fair Value, Less than Twelve Months | 3,232 | 9,502
Gross Unrealized Loss, Twelve Months or Greater | (4) | (7)
Fair Value, Twelve Months or Greater | 230 | 230
Gross Unrealized Loss, Total | (71) | (219)
Fair Value, Total | 3,462 | 9,732
Fixed-Maturity Securities [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (37) | (96)
Fair Value, Less than Twelve Months | 1,957 | 2,179
Gross Unrealized Loss, Twelve Months or Greater | (22) |
Fair Value, Twelve Months or Greater | 338 |
Gross Unrealized Loss, Total | (59) | (96)
Fair Value, Total | 2,295 | 2,179
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (36) | (181)
Fair Value, Less than Twelve Months | 6,071 | 20,233
Gross Unrealized Loss, Twelve Months or Greater | (30) |
Fair Value, Twelve Months or Greater | 193 |
Gross Unrealized Loss, Total | (66) | (181)
Fair Value, Total | 6,264 | 20,233
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (4) | (11)
Fair Value, Less than Twelve Months | 483 | 239
Gross Unrealized Loss, Twelve Months or Greater |  |
Fair Value, Twelve Months or Greater |  |
Gross Unrealized Loss, Total | (4) | (11)
Fair Value, Total | 483 | 239
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (202) | (273)
Fair Value, Less than Twelve Months | 10,266 | 10,742
Gross Unrealized Loss, Twelve Months or Greater | (213) | (246)
Fair Value, Twelve Months or Greater | 1,090 | 1,069
Gross Unrealized Loss, Total | (415) | (519)
Fair Value, Total | $ 11,356 | $ 11,811

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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