Equity Investments - Summary Financial Information of Balance Sheet for Unconsolidated Subsidiaries (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Aug. 01, 2014	Jul. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Loan receivable	$ 5,280	$ 24,005			$ 101,100
Liabilities and Equity
Equity			$ (476,454)	$ 514,214	$ 509,663	$ 469,264
WRT One South State Lender LP [Member]
Balance Sheets
Total assets	56,219	49,460
Total liabilities	2	2
ASSETS
Loan receivable	50,109	44,014
Other assets, net	6,110	5,446
TOTAL ASSETS	56,219	49,460
Liabilities and Equity
Accounts payable and accrued expenses	2	2
Other liabilities	0	0
TOTAL LIABILITIES	2	2
Equity	56,217	49,458
Total liabilities and equity	56,219	49,460
RE CDO Management LLC [Member]
Balance Sheets
Total assets	1,790	1,871
Total liabilities	8	12
ASSETS
Loan receivable	965	1,002
Other assets, net	825	869
TOTAL ASSETS	1,790	1,871
Liabilities and Equity
Accounts payable and accrued expenses	8	12
TOTAL LIABILITIES	8	12
Equity	1,782	1,859
Total liabilities and equity	1,790	1,871
Unconsolidated Subsidiaries [Member]
Balance Sheets
Investment in real estate	876,400	1,251,615
Total assets	954,374	1,453,983
Total debt	693,013	913,406
Total liabilities	40,943	179,224
Non controlling interests	52,052	88,363
ASSETS
TOTAL ASSETS	954,374	1,453,983
Liabilities and Equity
TOTAL LIABILITIES	$ 40,943	$ 179,224