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Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financial Assets: |  |
Total fixed-maturity securities | $ 165,435 | $ 97,084
Equity securities | 60,331 | 45,550
Total available-for-sale securities | 225,766 | 142,634
Fair Value, Measurements, Recurring [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 274,729 | 314,416
Total fixed-maturity securities | 165,435 | 97,084
Equity securities | 60,331 | 45,550
Total available-for-sale securities | 225,766 | 142,634
Total financial assets | 500,495 | 457,050
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 274,729 | 314,416
Total fixed-maturity securities | 55,946 | 32,900
Equity securities | 60,331 | 45,550
Total available-for-sale securities | 116,277 | 78,450
Total financial assets | 391,006 | 392,866
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 109,489 | 64,184
Total available-for-sale securities | 109,489 | 64,184
Total financial assets | 109,489 | 64,184
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 10,927 | 2,878
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 42,405 | 23,272
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | Asset-backed Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 4,163 | 697
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | Mortgage-Backed Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 14,438 | 3,009
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 82,537 | 57,503
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 10,467 | 9,557
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | Other [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 498 | 168
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 1) [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 4,056 | 1,069
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 1) [Member] | Corporate Bonds [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 41,423 | 22,274
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 1) [Member] | Redeemable Preferred Stock [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 10,467 | 9,557
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 2) [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 6,871 | 1,809
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 2) [Member] | Corporate Bonds [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 982 | 998
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 2) [Member] | Asset-backed Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 4,163 | 697
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 2) [Member] | Mortgage-Backed Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 14,438 | 3,009
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 2) [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 82,537 | 57,503
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] | (Level 2) [Member] | Other [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | $ 498 | $ 168

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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=51813488&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=49167202&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=51813488&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=49167202&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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