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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Class of Security: |  |
Total fixed maturity securities | $ 250,300 | $ 277,469
Total investments fair value | 270,856 | 311,097
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 57,593 | 98,363
Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 103,562 | 94,974
Commercial Paper [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 59,978 | 54,948
Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 26,835 | 18,666
Commercial Mortgage-Backed Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 2,332 | 10,518
Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value | 20,556 | 33,628
Fair Value, Inputs, Level 1 [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 89,262 | 90,144
Total investments fair value | 109,818 | 123,772
Fair Value, Inputs, Level 1 [Member] | Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 7,438 | 11,362
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 19,285 | 22,833
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 59,978 | 54,948
Fair Value, Inputs, Level 1 [Member] | Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 2,561 | 1,001
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value | 20,556 | 33,628
Fair Value, Inputs, Level 2 [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 161,038 | 187,325
Total investments fair value | 161,038 | 187,325
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 50,155 | 87,001
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 84,277 | 72,141
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 2 [Member] | Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 24,274 | 17,665
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 2,332 | 10,518
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value |  |
Fair Value, Inputs, Level 3 [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Total investments fair value |  |
Fair Value, Inputs, Level 3 [Member] | Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 3 [Member] | Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities |  |
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value |  |

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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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