Schedule III: Real Estate and Accumulated Depreciation - Summary Real Estate and Accumulated Depreciation (Details) - Aimco Real Estate - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total portfolio
Total portfolio balance at beginning of year	$ 8,308,590	$ 8,478,877	$ 8,486,166
Additions during the year:
Acquisitions	383,557	501,009	16,687
Capital additions	404,896	348,727	354,229
Dispositions and other	(359,452)	(1,020,023)	(378,205)
Total portfolio balance at end of year	8,737,591	8,308,590	8,478,877
Accumulated depreciation balance at beginning of year	2,585,115	2,848,609	2,730,758
Depreciation	358,661	354,208	344,960
Dispositions and other	(225,492)	(617,702)	(227,109)
Accumulated depreciation balance at end of year	$ 2,718,284	$ 2,585,115	$ 2,848,609