Equity Investments - Summary Financial Information of Balance Sheet for Unconsolidated Subsidiaries (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance Sheets
Total assets	$ 1,132,324	$ 923,163
Total liabilities	622,661	453,899
ASSETS
Loan Receivable	101,100	211,250
Other assets, net	3,314	2,464
TOTAL ASSETS	1,132,324	923,163
Liabilities and Equity
Accounts payable and accrued expenses	26,266	21,056
TOTAL LIABILITIES	622,661	453,899
Equity	509,663	469,264	408,836	309,847
Total Liabilities and Equity	1,132,324	923,163
WRT-One South State Lender LP [Member]
Balance Sheets
Total assets	47,201	49,303
Total liabilities	23	427
ASSETS
Loan Receivable	42,173	41,519
Other assets, net	5,028	7,784
TOTAL ASSETS	47,201	49,303
Liabilities and Equity
Accounts payable and accrued expenses	23	427
Other liabilities
TOTAL LIABILITIES	23	427
Equity	47,178	48,876
Total Liabilities and Equity	47,201	49,303
RE CDO Management LLC [Member]
Balance Sheets
Total assets	1,998	3,593
Total liabilities	16	36
ASSETS
Loan Receivable	1,033	1,070
Other assets, net	965	2,523
TOTAL ASSETS	1,998	3,593
Liabilities and Equity
Accounts payable and accrued expenses	16	36
Other liabilities
TOTAL LIABILITIES	16	36
Equity	1,982	3,557
Total Liabilities and Equity	1,998	3,593
Unconsolidated Subsidiaries [Member]
Balance Sheets
Investment in real estate	913,894	542,124
Total assets	1,022,352	631,481
Total debt	734,856	401,040
Total liabilities	799,949	463,218
Non controlling interests	34,071	15,997
Trust share of equity	119,304	65,311
ASSETS
TOTAL ASSETS	1,022,352	631,481
Liabilities and Equity
TOTAL LIABILITIES	$ 799,949	$ 463,218