Internal CRE Debt and Preferred Equity Ratings (Parenthetical) (Detail) (Commercial Mortgage, USD $)	Mar. 31, 2014		Dec. 31, 2013
Transaction to Real Estate Investments [Line Items]
Internal Ratings Watch List Loans	$ 31,473,000		$ 31,473,000
Senior Mortgages
Transaction to Real Estate Investments [Line Items]
Internal Ratings Watch List Loans	25,473,000	[1]	25,473,000	[2]
Non Accrual Loans | Senior Mortgages
Transaction to Real Estate Investments [Line Items]
Internal Ratings Watch List Loans	13,000,000
Internal Ratings Watch List Loans			$ 13,000,000

[1] (2) Includes approximately $13 million related to one loan on non accrual status.

[2] (1) Includes approximately $13 million related to one loan on non accrual status.