Real Estate and Accumulated Depreciation (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	$ 1,035,912
Third Party | Stonecrest
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	18,944
Third Party | Pine Tree
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	8,561
Third Party | Mandalay Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	12,876
Third Party | 1501 Yamato Road
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	22,920
Third Party | Preserve @ Colony Lakes
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	25,694
RAIT I | Stonecrest
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	7,125
RAIT I | Pine Tree
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	1,613
RAIT I | 1501 Yamato Road
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	32,500
RAIT I | Preserve @ Colony Lakes
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	8,025
Taberna IX and RAIT II | Mandalay Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances (Unpaid Principal)	$ 14,976