Real Estate Activities - Summary of Revenue and Expense Information for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Real Estate [Abstract]
Real estate revenue	$ 2,491	$ 9,379
Expenses:
Operating expenses	(1,109)	(3,989)
Depreciation and amortization	(345)	(1,074)
Interest expense	(494)	(1,753)
Total expenses	(1,948)	(6,816)
Operating results from discontinued operations	543	2,563
Disposal Group Including Discontinued Operation, Impairment of Assets	23,662	23,662
Gains on sales of discontinued operations	45,097	78,351
Income from discontinued operations	$ 21,978	$ 57,252