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Separate Accounts - Additional Information (Details) (USD $)
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Sep. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2014
Reinsurance transaction
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Apr. 30, 2013
Reinsurance transaction
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Sep. 30, 2014
Guaranteed minimum withdrawal benefit
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Dec. 31, 2013
Guaranteed minimum withdrawal benefit
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| Net Amount at Risk by Product and Guarantee [Line Items] | ||||||
| Value of variable annuity separate accounts | $ 131,700,000 | $ 123,900,000 | ||||
| Separate accounts guarantee liability | (2,500,000) | (4,700,000) | ||||
| Modified Coinsurance Transaction Separate Account Fund Balances | 317,800,000 | |||||
| Fund value | 2,082,347,000 | 2,096,212,000 | 26,300,000 | 23,600,000 | ||
| Future policy benefits | $ 927,307,000 | $ 910,228,000 | $ 600,000 | $ 600,000 |