Schedule IV - Mortgage Loans on Real Estate (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Accrued interest	$ 501,000
Percentage of loan representing total loan assets	3.00%
Mortgage loan face amount	142,631,000
Mortgage loan principal amount of delinquent payments	125,770,000
Whole Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage of loan representing total loan assets	3.00%
B Note [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage of loan representing total loan assets	3.00%
Mezzanine Other [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan face amount	1,486,000
Mortgage loan principal amount of delinquent payments	$ 348,000