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Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | $ 327,753 | $ 263,891
Available-for-Sale, Gross Unrealized Gains | 8,445 | 2,914
Available-for-Sale, Gross Unrealized Losses | (4,094) | (9,035)
Available-for-Sale, Fair Value | 332,104 | 257,770
Total fixed maturity [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 314,307 | 244,409
Available-for-Sale, Gross Unrealized Gains | 6,973 | 1,936
Available-for-Sale, Gross Unrealized Losses | (4,002) | (8,468)
Available-for-Sale, Fair Value | 317,278 | 237,877
Other investments [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 10,000 | 10,000
Available-for-Sale, Gross Unrealized Gains | 1,228 | 591
Available-for-Sale, Fair Value | 11,228 | 10,591
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 151,839 | 154,024
Available-for-Sale, Gross Unrealized Gains | 6,549 | 1,491
Available-for-Sale, Gross Unrealized Losses | (1,599) | (5,140)
Available-for-Sale, Fair Value | 156,789 | 150,375
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 152,560 | 80,344
Available-for-Sale, Gross Unrealized Gains | 424 | 445
Available-for-Sale, Gross Unrealized Losses | (314) | (361)
Available-for-Sale, Fair Value | 152,670 | 80,428
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 9,908 | 10,041
Available-for-Sale, Gross Unrealized Losses | (2,089) | (2,967)
Available-for-Sale, Fair Value | 7,819 | 7,074
Equity securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 3,446 | 9,482
Available-for-Sale, Gross Unrealized Gains | 244 | 387
Available-for-Sale, Gross Unrealized Losses | (92) | (567)
Available-for-Sale, Fair Value | $ 3,598 | $ 9,302

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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 before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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