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Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Coupon 5.60% 5.60%
Yield 4.10% 4.30%
Weighted Average Life 1 year 9 months 18 days 1 year 2 months 12 days