Real Estate Activities (Summary of Revenue and Expense Information for Discontinued Operations) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2013		Dec. 31, 2012
Real Estate [Abstract]
Real estate revenue									$ 10,014		$ 33,046
Expenses:
Operating expenses									(4,288)		(15,340)
Depreciation and amortization									(1,161)		(8,877)
Interest expense									(1,753)		(4,202)
Total expenses									(7,202)		(28,419)
Operating results from discontinued operations									2,812		4,627
Impairment of assets of discontinued operations									(23,662)		(3,805)
Gains on sales of discontinued operations									78,512		947
Income from discontinued operations	$ 408	[1],[2]	$ 21,978	[1]	$ 1,000	[1]	$ 34,276	[1]	$ 57,662	[1]	$ 1,769

[1] Includes impairment losses of $1.3 million (1st Quarter 2014), $16.1 million (2nd Quarter 2014) and $2.3 million (3rd Quarter 2014). Includes impairment losses on discontinued operations of $23.7 million (3rd Quarter 2013)

[2] Fourth Quarter revenue includes a significant portion of annual percentage rent as most percentage rent minimum sales levels are met in the fourth quarter.