Fair Value of Financial Instruments (Fair Value of Assets and Liabilities, Measured on a Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Assets And Liabilities Carrying Value And Fair Value [Line Items]
Investments in real estate fund	$ 219,204	[1]	$ 62,067	[1]	$ 78,002
Derivative assets, at fair value (1)	5,522	[2]	9,189	[2]	0
Total assets	1,600		1,200
Interest rate swap liabilities	0		0		0
Fair Value, Measurements, Recurring [Member]
Assets And Liabilities Carrying Value And Fair Value [Line Items]
Investments in real estate fund	1,891		1,484
CMBS	217,313		60,583
Derivative assets, at fair value (1)	5,522		9,189
Total assets	224,726		71,256
Interest rate swap liabilities	(12,811)		(1,719)
Series D Preferred Stock embedded derivative	(11,520)		(16,736)
Contingent consideration arrangements	(4,818)
Total liabilities	(29,149)		(18,455)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets And Liabilities Carrying Value And Fair Value [Line Items]
Investments in real estate fund	0		0
CMBS	0		0
Derivative assets, at fair value (1)	0		0
Total assets	0		0
Interest rate swap liabilities	0		0
Series D Preferred Stock embedded derivative	0		0
Contingent consideration arrangements	0
Total liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets And Liabilities Carrying Value And Fair Value [Line Items]
Investments in real estate fund	1,891		1,484
CMBS	0		0
Derivative assets, at fair value (1)	5,522		9,189
Total assets	7,413		10,673
Interest rate swap liabilities	(12,811)		(1,719)
Series D Preferred Stock embedded derivative	0		0
Contingent consideration arrangements	0
Total liabilities	(12,811)		(1,719)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets And Liabilities Carrying Value And Fair Value [Line Items]
Investments in real estate fund	0		0
CMBS	217,313		60,583
Derivative assets, at fair value (1)	0		0
Total assets	217,313		60,583
Interest rate swap liabilities	0		0
Series D Preferred Stock embedded derivative	(11,520)		(16,736)
Contingent consideration arrangements	(4,818)
Total liabilities	$ (16,338)		$ (16,736)

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

[2] These line items have been updated since the Amended 10-K. Certain line items have been reclassified and included within the deferred costs and other assets, net in the accompanying consolidated balance sheet. For detail on the restatement and reclassification adjustments, see Note 2 - Restatement of Previously Issued Financial Statements.