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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Class of Security: |  |
Total fixed-maturity securities | $ 137,016 | $ 218,801
Total investments fair value | 153,533 | 263,664
Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 90,269 | 124,774
Total investments fair value | 106,786 | 169,637
Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 46,747 | 94,027
Total investments fair value | 46,747 | 94,027
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 6,480 | 15,832
Obligations of U.S. Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 3,021 | 6,299
Obligations of U.S. Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 3,459 | 9,533
Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 62,803 | 81,892
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 30,474 | 11,891
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 32,329 | 70,001
Commercial Paper [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 54,997 | 98,932
Commercial Paper [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 54,997 | 98,932
Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 12,736 | 22,145
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 1,777 | 7,652
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 10,959 | 14,493
Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value | 16,517 | 44,863
Money Market Funds [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total investments fair value | $ 16,517 | $ 44,863

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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 Fixed maturity securities estimated fair value. + References No definition available. + Details
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