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Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financial Assets: |  |
Total fixed-maturity securities | $ 170,016 | $ 125,009
Equity securities | 51,460 | 48,237
Total available-for-sale securities | 221,476 | 173,246
Fair Value, Measurements, Recurring [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 291,880 | 267,738
Total fixed-maturity securities | 170,016 | 125,009
Equity securities | 51,460 | 48,237
Total available-for-sale securities | 221,476 | 173,246
Total financial assets | 513,356 | 440,984
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 440 | 113
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 77,248 | 37,819
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 79,767 | 77,324
Fair Value, Measurements, Recurring [Member] | Exchange-Traded Debt [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 12,316 | 9,429
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 245 | 324
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 291,880 | 267,738
Total fixed-maturity securities | 89,265 | 46,702
Equity securities | 51,460 | 48,237
Total available-for-sale securities | 140,725 | 94,939
Total financial assets | 432,605 | 362,677
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 440 | 113
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Corporate Bonds [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 76,264 | 36,836
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Exchange-Traded Debt [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 12,316 | 9,429
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Redeemable Preferred Stock [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 245 | 324
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 80,751 | 78,307
Total available-for-sale securities | 80,751 | 78,307
Total financial assets | 80,751 | 78,307
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Corporate Bonds [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 984 | 983
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | $ 79,767 | $ 77,324

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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 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=65884222&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=66010992&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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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