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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 | Dec. 31, 2017 | Dec. 31, 2016
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Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | $ 469,739 | $ 489,871
Available-for-Sale, Gross Unrealized Gains | 7,851 | 8,156
Available-for-Sale, Gross Unrealized Losses | (2,714) | (5,567)
Available-for-Sale, Fair Value | 474,876 | 492,460
Other Investments [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost |  | 10,000
Available-for-Sale, Gross Unrealized Gains |  | 3,330
Available-for-Sale, Fair Value |  | 13,330
Total Fixed Maturity [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 461,236 | 479,871
Available-for-Sale, Gross Unrealized Gains | 7,072 | 4,793
Available-for-Sale, Gross Unrealized Losses | (2,714) | (5,567)
Available-for-Sale, Fair Value | 465,594 | 479,097
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 244,898 | 231,168
Available-for-Sale, Gross Unrealized Gains | 6,819 | 4,340
Available-for-Sale, Gross Unrealized Losses | (577) | (3,215)
Available-for-Sale, Fair Value | 251,140 | 232,293
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 130,210 | 182,350
Available-for-Sale, Gross Unrealized Gains | 224 | 436
Available-for-Sale, Gross Unrealized Losses | (212) | (271)
Available-for-Sale, Fair Value | 130,222 | 182,515
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 18,813 | 10,428
Available-for-Sale, Gross Unrealized Gains |  | 17
Available-for-Sale, Gross Unrealized Losses | (799) | (1,103)
Available-for-Sale, Fair Value | 18,014 | 9,342
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 67,315 | 55,925
Available-for-Sale, Gross Unrealized Gains | 29 |
Available-for-Sale, Gross Unrealized Losses | (1,126) | (978)
Available-for-Sale, Fair Value | 66,218 | 54,947
Equity Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 8,503 |
Available-for-Sale, Gross Unrealized Gains | 779 | 33
Available-for-Sale, Fair Value | $ 9,282 | $ 33

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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=82897076&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=82897076&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=75030427&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=82897076&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=82896770&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=82897076&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=82897076&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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