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Investments - Schedule of Credit Quality of Investments With Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 352,983 | $ 289,418
Percentage of total Fair Value | 100.00% | 100.00%
Standard & Poor's, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 28,505 | 82,889
Percentage of total Fair Value | 8.10% | 28.60%
Standard & Poor's, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 192,903 | 120,976
Percentage of total Fair Value | 54.70% | 41.80%
Standard & Poor's, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 76,030 | 46,689
Percentage of total Fair Value | 21.50% | 16.10%
Standard & Poor's, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 42,091 | 38,114
Percentage of total Fair Value | 11.90% | 13.20%
Standard & Poor's, BB- Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 2,714 |
Percentage of total Fair Value | 0.80% |
Standard & Poor's, Not Rated [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 10,740 | $ 750
Percentage of total Fair Value | 3.00% | 0.30%

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- Details
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- Definition Amount of available for sale securities with contractual maturities. + References No definition available. + Details
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- Definition Represents the amount of certain securities (as a percentage) out of total fixed maturities securities. + References No definition available. + Details
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