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Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Financial Assets: |  |
Total fixed-maturity securities | $ 133,113 | $ 112,151
Equity securities | 22,872 | 17,649
Total available-for-sale securities | 155,985 | 129,800
Fair Value, Measurements, Recurring [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 296,576 | 293,398
Total available-for-sale securities | 155,985 | 129,800
Total | 452,561 | 423,198
Financial Liabilities: |  |
Total long-term debt | 130,676 | 130,020
Fair Value, Measurements, Recurring [Member] | Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 43,438 | 43,390
Fair Value, Measurements, Recurring [Member] | Convertible Debt [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 87,238 | 86,630
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 133,113 | 112,151
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Financial Assets: |  |
Equity securities | 22,872 | 17,649
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 4,453 | 4,564
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 30,772 | 25,404
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 11,278 | 11,332
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 83,045 | 70,451
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 3,565 | 400
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 296,576 | 293,398
Total available-for-sale securities | 59,885 | 46,045
Total | 356,461 | 339,443
Financial Liabilities: |  |
Total long-term debt |  |
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt |  |
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Convertible Debt [Member] |  |
Financial Liabilities: |  |
Total long-term debt |  |
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 37,013 | 28,396
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Equity Securities [Member] |  |
Financial Assets: |  |
Equity securities | 22,872 | 17,649
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 3,611 | 3,520
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 29,837 | 24,476
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 3,565 | 400
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] |  |
Financial Assets: |  |
Cash and cash equivalents |  |
Total available-for-sale securities | 96,100 | 83,755
Total | 96,100 | 83,755
Financial Liabilities: |  |
Total long-term debt | 43,438 | 43,390
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 43,438 | 43,390
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Convertible Debt [Member] |  |
Financial Liabilities: |  |
Total long-term debt |  |
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 96,100 | 83,755
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Equity Securities [Member] |  |
Financial Assets: |  |
Equity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 842 | 1,044
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 935 | 928
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 11,278 | 11,332
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities | 83,045 | 70,451
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] |  |
Financial Assets: |  |
Cash and cash equivalents |  |
Total available-for-sale securities |  |
Total |  |
Financial Liabilities: |  |
Total long-term debt | 87,238 | 86,630
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Convertible Debt [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 87,238 | 86,630
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Equity Securities [Member] |  |
Financial Assets: |  |
Equity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member] |  |
Financial Assets: |  |
Total fixed-maturity securities |  |

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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=25499696&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=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 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=28360136&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=6871852&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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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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