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Reserve in Addition to the Account Balance, Based on Expected No-Lapse Guarantee Benefits and Expected Policy Assessments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	$ 2,214,000	$ 2,034,000
Ordinary/Traditional Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	691,000	628,000
Universal Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	481,000	459,000
Deferred Annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	827,000	730,000
Investment Contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	198,000	200,000
Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	$ 17,000	$ 17,000

The sum of the known and estimated amounts payable as of the balance sheet date to life insurance policyholders that relates to insured events which can be viewed as either (a) the present value of future benefits to be paid to or on behalf of policyholders and expenses less the present value of future net premiums payable under the insurance contracts or (b) the accumulated amount of net premiums already collected less the accumulated amount of benefits and expenses already paid to or on behalf of policyholders.

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