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Earnings per Share / Unit (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 112,438 | $ 76,492 | $ 10,446
Less: |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  | 4,165 | (4,507) | 3,751
Dividends on preferred shares/units |  |  |  |  |  |  |  |  | 52,586 | 60,718 | 40,237
Redemption of participating preferred shares/units |  |  |  |  |  |  |  |  | 32,215 | 42,416 | 0
Allocation to participating securities |  |  |  |  |  |  |  |  | 85 | 0 | 0
Numerator for income (loss) per common share–basic and diluted |  |  |  |  |  |  |  |  | $ 23,387 | $ (22,135) | $ (33,542)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic (in shares) | shares |  |  |  |  |  |  |  |  | 293,640,500 | 264,254,718 | 234,010,168
Effect of dilutive securities: Share-based compensation plan (in shares) | shares |  |  |  |  |  |  |  |  | 627,830 | 0 | 0
Weighted-average common shares outstanding - diluted (in shares) | shares |  |  |  |  |  |  |  |  | 294,268,330 | 264,254,718 | 234,010,168
Net income (loss) per common share/unit |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares | $ 0.06 | $ 0.05 | $ (0.05) | $ 0.02 | $ (0.08) | $ 0.01 | $ 0.00 | $ (0.01) | $ 0.08 | $ (0.08) | $ (0.14)
Diluted (in dollars per share) | $ / shares | 0.06 | 0.05 | (0.05) | 0.02 | (0.08) | 0.00 | 0.00 | (0.01) | $ 0.08 | $ (0.08) | $ (0.14)
Potentially dilutive securities | shares |  |  |  |  |  |  |  |  | 0 | 17,084,135 | 32,914,593
Operating Partnership | Class A Units |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share/unit |  |  |  |  |  |  |  |  |  |  |
Stock exchange ratio |  |  |  |  |  |  |  |  | 1 |  |
American Homes 4 Rent, L.P. |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 112,438 | $ 76,492 | $ 10,446
Less: |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  | (259) | 141 | (562)
Dividends on preferred shares/units |  |  |  |  |  |  |  |  | 52,586 | 60,718 | 40,237
Redemption of participating preferred shares/units |  |  |  |  |  |  |  |  | 32,215 | 42,416 | 0
Allocation to participating securities |  |  |  |  |  |  |  |  | 85 | 0 | 0
Income allocated to Series C and D limited partners |  |  |  |  |  |  |  |  | 0 | 0 | 10,730
Numerator for income (loss) per common share–basic and diluted |  |  |  |  |  |  |  |  | $ 27,811 | $ (26,783) | $ (39,959)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common units outstanding - basic (in shares) | shares |  |  |  |  |  |  |  |  | 348,990,561 | 319,753,206 | 277,912,532
Effect of dilutive securities: Share-based compensation plan (in shares) | shares |  |  |  |  |  |  |  |  | 627,830 | 0 | 0
Weighted-average common units outstanding - diluted (in shares) | shares |  |  |  |  |  |  |  |  | 349,618,391 | 319,753,206 | 277,912,532
Net income (loss) per common share/unit |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares | 0.06 | 0.05 | (0.05) | 0.02 | (0.08) | 0.01 | 0.00 | (0.01) | $ 0.08 | $ (0.08) | $ (0.14)
Diluted (in dollars per share) | $ / shares | $ 0.06 | $ 0.05 | $ (0.05) | $ 0.02 | $ (0.08) | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.08 | $ (0.08) | $ (0.14)
Potentially dilutive securities | shares |  |  |  |  |  |  |  |  | 0 | 17,084,135 | 32,914,593
American Homes 4 Rent, L.P. | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share/unit |  |  |  |  |  |  |  |  |  |  |
Net loss per common unit - basic and diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0.61
American Homes 4 Rent, L.P. | Series D Perpetual Preferred Shares/Units |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share/unit |  |  |  |  |  |  |  |  |  |  |
Net loss per common unit - basic and diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | 0 | 0 | 1.32
American Homes 4 Rent, L.P. | Series E Operating Partnership Units |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share/unit |  |  |  |  |  |  |  |  |  |  |
Net loss per common unit - basic and diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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