Real Estate Activities - Summary of Revenue and Expense Information for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Real Estate [Abstract]
Real estate revenue	$ 1,429	$ 6,643	$ 4,172	$ 13,432
Expenses:
Operating expenses	(173)	(3,209)	(1,614)	(6,422)
Depreciation and amortization	0	(1,827)	0	(3,574)
Interest expense	(587)	(980)	(1,259)	(1,930)
Total expenses	(760)	(6,016)	(2,873)	(11,926)
Operating results from discontinued operations	669	627	1,299	1,506
Gains on sales of discontinued operations	0	0	33,254	0
Income from discontinued operations	$ 669	$ 627	$ 34,553	$ 1,506