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Schedule IV - Mortgage Loans on Real Estate (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Mortgage Loans on Real Estate, Federal Income Tax Basis (in Dollars) 70.7
Mortgage Loans on Real Estate, Face Amount of Mortgages (in Dollars) 109,250,000 [1]
Minimum [Member] | Individually Less Than 3% [Member] | Mortgages [Member]
 
Mortgage Loans on Real Estate, Term 1 year
Minimum [Member] | Individually Less Than 3% [Member] | Other Loans on Real Estate [Member]
 
Mortgage Loans on Real Estate, Term 6 years
2.28%
Minimum [Member] | Individually Less Than 3% [Member]
 
Mortgage Loans on Real Estate, Face Amount of Mortgages (in Dollars) 400,000
Maximum [Member] | Individually Less Than 3% [Member] | Mortgages [Member]
 
Mortgage Loans on Real Estate, Term 18 years
Maximum [Member] | Individually Less Than 3% [Member] | Other Loans on Real Estate [Member]
 
Mortgage Loans on Real Estate, Term 15 years
5.50%
Maximum [Member] | Individually Less Than 3% [Member]
 
Mortgage Loans on Real Estate, Face Amount of Mortgages (in Dollars) 3,300,000
Individually Less Than 3% [Member] | Mortgages [Member]
 
Mortgage Loans on Real Estate, Minimum Interest Rate in Range 6.00%
Mortgage Loans on Real Estate, Maximum Interest Rate in Range 12.00%
Individually Less Than 3% [Member]
 
Mortgage Loans on Real Estate, Number of Loans 14
Mortgages [Member]
 
Mortgage Loans on Real Estate, Face Amount of Mortgages (in Dollars) 104,800,000 [1]
Other Loans on Real Estate [Member]
 
Mortgage Loans on Real Estate, Face Amount of Mortgages (in Dollars) 2,050,000 [1]
[1] The instruments actual cash flows are denominated in U.S. dollars, Canadian dollars and Mexican pesos as indicated by the geographic location above