Basis of Presentation and Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Deferred tax asset, net (Note 9)	$ 67,060	$ 32,227
Aimco Real Estate
Segment Reporting, Asset Reconciling Item [Line Items]
Investments in securitization trust that holds Aimco property debt	83,587	82,794
Deferred tax asset, net (Note 9)	67,060	32,227
Intangible assets, net	43,424	38,701
Prepaid expenses, real estate taxes and insurance	25,657	25,144
Software, equipment and leasehold improvements	18,309	20,048
Investments in unconsolidated real estate partnerships	12,650	12,636
Accounts and notes receivable, net	55,630	17,035
Deferred costs, deposits and other	45,224	44,154
Total other assets	$ 351,541	$ 272,739