Equity Investments - Summary Financial Information of Income Statement for Unconsolidated Subsidiaries (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended						7 Months Ended	12 Months Ended
	Jul. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jul. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Income Statements
Interest, dividends and discount accretion								$ 9,643	$ 18,455	$ 21,123
Revenue
Operating income	8,479	22,917	24,560	21,330	15,844	16,579	16,567	55,956	70,320	55,053
Expenses
General and administrative								4,283	4,356	3,529
Other Income and Expense
Other Income								12,886	24,033	23,439
Gain on sale of assets								11,094	11,005	945
WRT One South State Lender LP [Member]
Income Statements
Income from continuing operations									8,420	7,251	10,123
Revenue
Interest Income									8,506	7,378	10,123
Operating income									8,506	7,378	10,123
Expenses
General and administrative									86	127
Total expense									86	127
Other Income and Expense
Other Income									0	0	0
Income from continuing operations									8,420	7,251	10,123
RE CDO Management LLC [Member]
Income Statements
Income from continuing operations									7,417	135	19
Revenue
Management Fee Income									226	618	149
Operating income									226	618	149
Expenses
General and administrative									290	354	79
Other expenses									1,459	129	51
Total expense									1,749	483	130
Other Income and Expense
Gain on sale of assets									8,940
Income from continuing operations									7,417	135	19
Unconsolidated Subsidiaries [Member]
Income Statements
Rental Revenue									85,660	73,861	94,432
Interest, dividends and discount accretion									40,229	28,041	14,017
Expenses									93,344	89,883	98,107
Other loss									23,188	6,158	5,297
Income from continuing operations									9,357	5,861	5,045
Other Income and Expense
Income from continuing operations									$ 9,357	$ 5,861	$ 5,045