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Escrow Deposits, Prepaid Expenses and Other Assets - Summary and Investments in Joint Ventures (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Escrow deposits, prepaid expenses and other		$ 40,320		$ 40,320			$ 38,642
Investments in joint ventures		63,169		63,169			56,789
Notes receivable		36,706		36,706			6,012
Commercial real estate, vehicles and FF&E, net		42,699		42,699			44,591
Total		182,894		182,894			146,034
American Homes 4 Rent, L.P.
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Total		182,894		182,894			145,807
American Homes 4 Rent, L.P. | Joint Venture, Single-Family Rental Homes, Southeast
Schedule of Equity Method Investments [Line Items]
Aggregate cost						$ 312,500
Joint venture, initial term	5 years
Ownership percentage	20.00%
Investment in joint venture balance		26,000		26,000			$ 18,000
Commercial Real Estate, Vehicles, and Furniture, Fixtures, and Equipment
Schedule of Equity Method Investments [Line Items]
Depreciation expense		2,000	$ 1,800	5,700	$ 5,200
Joint Venture | Property and development services
Schedule of Equity Method Investments [Line Items]
Management fee income		$ 1,000	$ 300	$ 2,400	$ 700

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