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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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