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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Class of Security: |  |
Total fixed-maturity securities | $ 107,344 | $ 60,641
Total investments fair value | 128,315 | 149,492
Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 77,163 | 20,770
Total investments fair value | 98,134 | 109,621
Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 30,181 | 39,871
Total investments fair value | 30,181 | 39,871
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 70,483 | 6,475
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 65,993 | 3,009
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 4,490 | 3,466
Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 25,700 | 41,484
Corporate Debt Securities [Member] | Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 10,099 | 14,939
Corporate Debt Securities [Member] | Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 15,601 | 26,545
Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 11,161 | 12,682
Foreign Corporate Debt Securities [Member] | Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 1,071 | 2,822
Foreign Corporate Debt Securities [Member] | Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 10,090 | 9,860
Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value | 20,971 | 88,851
Money Market Funds [Member] | Level 1 |  |
Class of Security: |  |
Total investments fair value | $ 20,971 | $ 88,851

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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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