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Significant Accounting Policies (Detail) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net $ 41,800,000 $ 42,300,000
Structured Project Loan [Member]
   
Valuation Allowances and Reserves, Balance   9,900,000
Reinsurance Segment [Member]
   
Valuation Allowances and Reserves, Balance 105,300,000 121,900,000
Reinsurance Receivables $ 3,800,000,000