Fair Value of Financial Instruments (Fair Value of Assets and Liabilities, Measured on a Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013		Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in real estate fund	$ 59,131	$ 62,067	[1]
Interest rate swap assets	8,775	9,189		0
Interest rate swap liabilities				0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in real estate fund		1,484
CMBS	59,077	60,583
Interest rate swap assets	8,775	9,189
Total assets	67,852	71,256
Interest rate swap liabilities	(5,986)	(1,719)
Series D Preferred Stock embedded derivative		(16,736)
Total liabilities	(5,986)	(18,455)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in real estate fund		0
CMBS	0	0
Interest rate swap assets	0	0
Total assets	0	0
Interest rate swap liabilities	0	0
Series D Preferred Stock embedded derivative		0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in real estate fund		1,484
CMBS	0	0
Interest rate swap assets	8,775	9,189
Total assets	8,775	10,673
Interest rate swap liabilities	(5,986)	(1,719)
Series D Preferred Stock embedded derivative		0
Total liabilities	(5,986)	(1,719)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in real estate fund		0
CMBS	59,077	60,583
Interest rate swap assets	0	0
Total assets	59,077	60,583
Interest rate swap liabilities	0	0
Series D Preferred Stock embedded derivative		(16,736)
Total liabilities	$ 0	$ (16,736)

[1] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Consolidated Financial Statements.