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Separate Accounts - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2012
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Dec. 31, 2011
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|---|---|---|
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Guaranteed Minimum Withdrawal Benefit
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| Net Amount at Risk by Product and Guarantee [Line Items] | ||
| Value of variable annuity separate accounts | $ 100.1 | $ 86.6 |
| Separate accounts guarantee liability | (0.4) | (0.2) |
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Guaranteed Minimum Death Benefit
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| Net Amount at Risk by Product and Guarantee [Line Items] | ||
| Reserve held for the variable annuity | $ 0.1 | $ 0.2 |