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Investments - Summary of Cost or Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value Available-for-Sale Securities (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] |  |
Cost or Amortized Cost | $ 129,680 | $ 110,738
Equity securities, Cost or Amortized Cost | 22,174 | 17,248
Total available-for-sale securities, Cost or Amortized Cost | 151,854 | 127,986
Debt securities | 133,113 | 112,151
Total available-for-sale securities, gross unrealized gain | 4,747 | 2,862
Total available-for-sale securities, gross unrealized loss | (616) | (1,048)
Equity securities | 22,872 | 17,649
Total available-for-sale securities | 155,985 | 129,800
Fixed-Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 129,680 | 110,738
Gross Unrealized Gain | 3,634 | 1,942
Gross Unrealized Loss | (201) | (529)
Debt securities | 133,113 | 112,151
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 4,351 | 4,549
Gross Unrealized Gain | 103 | 37
Gross Unrealized Loss | (1) | (22)
Debt securities | 4,453 | 4,564
Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 30,062 | 25,139
Gross Unrealized Gain | 781 | 484
Gross Unrealized Loss | (71) | (219)
Debt securities | 30,772 | 25,404
Fixed-Maturity Securities [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 10,867 | 10,929
Gross Unrealized Gain | 470 | 499
Gross Unrealized Loss | (59) | (96)
Debt securities | 11,278 | 11,332
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 80,877 | 69,715
Gross Unrealized Gain | 2,234 | 917
Gross Unrealized Loss | (66) | (181)
Debt securities | 83,045 | 70,451
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 3,523 | 406
Gross Unrealized Gain | 46 | 5
Gross Unrealized Loss | (4) | (11)
Debt securities | 3,565 | 400
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Cost or Amortized Cost | 22,174 | 17,248
Equity securities, gross unrealized gain | 1,113 | 920
Equity securities, gross unrealized loss | (415) | (519)
Equity securities | $ 22,872 | $ 17,649

X
- Definition Amount of accumulated pre-tax unrealized gains 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 accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale equity securities impacting investments. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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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