Aimco Equity - Pro Forma Earnings Per Share (Details) - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Weighted average shares, basic (in shares)	151,152	151,595	151,282
Weighted average shares, diluted (in shares)	151,334	152,060	151,669
Basic earnings per share (in dollars per share)	$ 4.34	$ 2.02	$ 2.76
Diluted earnings per share (in dollars per share)	$ 4.34	$ 2.02	$ 2.75

Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

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