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Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 48,994 | $ 42,192
Gross Unrealized Gain | 2,076 | 2,831
Gross Unrealized Loss | (616) | (194)
Debt securities | 40,119 | 35,953
Equity securities | 10,335 | 8,876
Total available-for-sale securities | 50,454 | 44,829
Fixed-Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 38,838 | 33,436
Gross Unrealized Gain | 1,510 | 2,528
Gross Unrealized Loss | (229) | (11)
Debt securities | 40,119 | 35,953
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,671 | 1,359
Gross Unrealized Gain | 45 | 88
Gross Unrealized Loss | (3) |
Debt securities | 1,713 | 1,447
Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,017 | 10,298
Gross Unrealized Gain | 375 | 572
Gross Unrealized Loss | (86) | (10)
Debt securities | 15,306 | 10,860
Fixed-Maturity Securities [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,133 | 10,708
Gross Unrealized Gain | 589 | 936
Gross Unrealized Loss | (82) |
Debt securities | 11,640 | 11,644
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,251 | 10,152
Gross Unrealized Gain | 489 | 914
Gross Unrealized Loss | (56) |
Debt securities | 10,684 | 11,066
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 766 | 919
Gross Unrealized Gain | 12 | 18
Gross Unrealized Loss | (2) | (1)
Debt securities | 776 | 936
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,156 | 8,756
Gross Unrealized Gain | 566 | 303
Gross Unrealized Loss | (387) | (183)
Equity securities | $ 10,335 | $ 8,876

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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