Real Estate Activities (Summary of Revenue and Expense Information for Discontinued Operations) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate [Abstract]
Real estate revenue			$ 10,014
Expenses:
Operating expenses			(4,288)
Depreciation and amortization			(1,161)
Interest expense			(1,753)
Total expenses			(7,202)
Operating results from discontinued operations			2,812
Impairment of assets of discontinued operations			(23,662)
Gains on sales of discontinued operations			78,512
Income from discontinued operations	$ 0	$ 0	$ 57,662