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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 | Sep. 30, 2016 | Dec. 31, 2015
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Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | $ 470,497 | $ 386,109
Available-for-Sale, Gross Unrealized Gains | 13,787 | 9,447
Available-for-Sale, Gross Unrealized Losses | (1,458) | (3,286)
Available-for-Sale, Fair Value | 482,826 | 392,270
Other Investments [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 10,000 | 10,000
Available-for-Sale, Gross Unrealized Gains | 2,174 | 2,217
Available-for-Sale, Fair Value | 12,174 | 12,217
Total Fixed Maturity [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 460,497 | 376,109
Available-for-Sale, Gross Unrealized Gains | 11,581 | 7,199
Available-for-Sale, Gross Unrealized Losses | (1,458) | (3,286)
Available-for-Sale, Fair Value | 470,620 | 380,022
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 188,689 | 164,684
Available-for-Sale, Gross Unrealized Gains | 8,450 | 6,942
Available-for-Sale, Gross Unrealized Losses | (359) | (207)
Available-for-Sale, Fair Value | 196,780 | 171,419
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 197,167 | 202,537
Available-for-Sale, Gross Unrealized Gains | 2,259 | 253
Available-for-Sale, Gross Unrealized Losses | (214) | (1,486)
Available-for-Sale, Fair Value | 199,212 | 201,304
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 12,026 | 8,888
Available-for-Sale, Gross Unrealized Gains | 51 | 4
Available-for-Sale, Gross Unrealized Losses | (797) | (1,593)
Available-for-Sale, Fair Value | 11,280 | 7,299
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 62,615 |
Available-for-Sale, Gross Unrealized Gains | 821 |
Available-for-Sale, Gross Unrealized Losses | (88) |
Available-for-Sale, Fair Value | 63,348 |
Equity Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Gross Unrealized Gains | 32 | 31
Available-for-Sale, Fair Value | $ 32 | $ 31

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt 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=73527792&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 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=73527792&loc=d3e27161-111563 + 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=65884222&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=73527792&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=66010992&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=73527792&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=73527792&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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