Schedule III - Changes in Real Estate (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Beginning balance	$ 32,976,000
Liquidation adjustment, net	(7,114,000)
Disposals	(15,938,000)
Ending balance	$ 9,924,000