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Life Policy Reserves - Additional Information (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
Deferred Annuities and Investment Contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	1,025,000	930,000
Life policy reserves, fair value	1,002,000	933,000
Life Policy Loans
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	37,000	40,000
Life policy reserves, fair value	$ 43,000	$ 46,000

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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