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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Class of Security: |  |
Total fixed maturity securities | $ 281,547 | $ 277,469
Total investments fair value | 306,621 | 311,097
Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 73,896 | 98,363
Corporate debt securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 108,114 | 94,974
Commercial paper [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 69,607 | 54,948
Foreign corporate debt securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 21,082 | 18,666
Commercial Mortgage-backed securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 8,848 | 10,518
Money market funds [Member] |  |
Class of Security: |  |
Total investments fair value | 25,074 | 33,628
Fair Value, Inputs, Level 1 [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 107,700 | 90,144
Total investments fair value | 132,774 | 123,772
Fair Value, Inputs, Level 1 [Member] | Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 11,305 | 11,362
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 25,236 | 22,833
Fair Value, Inputs, Level 1 [Member] | Commercial paper [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 69,607 | 54,948
Fair Value, Inputs, Level 1 [Member] | Foreign corporate debt securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 1,552 | 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 | 25,074 | 33,628
Fair Value, Inputs, Level 2 [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 173,847 | 187,325
Total investments fair value | 173,847 | 187,325
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 62,591 | 87,001
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 82,878 | 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 | 19,530 | 17,665
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage-backed securities [Member] |  |
Class of Security: |  |
Total fixed maturity securities | 8,848 | 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 This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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