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Commercial Mortgage Loan Portfolio (Parenthetical) (Detail) (Commercial mortgage loans [Member], Condo Conversion [Member])	12 Months Ended
	Dec. 31, 2013 option
Condo Conversion - NY, NY December 2012 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of Options to Extend Loan Agreement	2
Debt Instrument, Option to Extend Loan Agreement, Term	1 year
Condo Conversion - NY, NY August 2013 [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument, Option to Extend Loan Agreement, Term	1 year

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