Schedule III - Reconciliation of Real Estate Assets and Accumulated Depreciation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate
Balance at beginning of period		$ 377,446	$ 587,952	$ 670,868
Additions during the period:
Other acquisitions				55,923
Improvements, etc.		3,301	3,632	10,273
Consolidation of property		15,082
Liquidation adjustment				166,603
Deductions during this period:
Cost of real estate sold		(138,656)	(82,793)	(99,679)
Asset impairments		(3,908)		(9,287)
Deconsolidation of property			(118,765)	(140,491)
Liquidation adjustment		(52,590)	(12,580)
Disposal of fully amortized assets				(5,293)
Transfer of discontinued operations				(60,965)
Balance at end of period		200,675	377,446	587,952
Accumulated Depreciation
Balance at beginning of period		23,584	30,627	56,448
Additions charged to operating expenses				10,595
Disposal of properties		(9,561)	(2,227)	(5,268)
Deconsolidation of property			(4,816)	(16,017)
Transfer to discontinued operations, net	[1]			(9,838)
Disposal of fully amortized assets				(5,293)
Balance at end of period		$ 14,023	$ 23,584	$ 30,627

[1] In 2014, the Englewood, Colorado; Chicago, Illinois (River City); Louisville, Kentucky; and Amherst, New York properties were placed into discontinued operations.