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, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Real Estate [Abstract]
Real estate revenue																	$ 10,014		$ 33,046		$ 35,270
Expenses:
Operating expenses																	(4,288)		(15,340)		(15,842)
Depreciation and amortization																	(1,161)		(8,877)		(12,402)
Interest expense																	(1,753)		(4,202)		(5,108)
Total expenses																	(7,202)		(28,419)		(33,352)
Operating results from discontinued operations																	2,812		4,627		1,918
Impairment of assets of discontinued operations																	(23,662)		(3,805)		(27,977)
Gains on sales of discontinued operations																	78,512		947		0
Income (loss) from discontinued operations	$ 408	[1],[2]	$ 21,978	[1]	$ 1,000	[1]	$ 34,276	[1]	$ (1,746)	[1],[2]	$ 1,344	[1]	$ 912	[1]	$ 1,259	[1]	$ 57,662	[1]	$ 1,769	[1]	$ (26,059)

[1] Includes impairments losses on discontinued operations of $23.7 million (3rd Quarter 2013) and $3.8 million (4th Quarter 2012).

[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.