Basis of Presentation and Summary of Significant Accounting Policies - Tax Credit Arrangements (Details)	12 Months Ended
	Dec. 31, 2014
Tax Credit Arrangements [Abstract]
Period Of Time Over Which Low Income Housing Tax Credits Realized By Investors	10 years
Typical Compliance Period Related To Low Income Housing Tax Credit Arrangements	15 years
General Partner Interests In Low Income Housing Tax Credit Partnerships Held By Aimco	one percent or less
Limited Partner Interests In Low Income Housing Tax Credit Partnerships Held By Unaffiliated Investors	at least 99%