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Shareholders' Equity / Partners' Capital - Class A Common Shares (Details) $ / shares in Units, $ in Thousands		3 Months Ended			12 Months Ended
	Apr. 05, 2018	Sep. 30, 2018 USD ($) shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2017 $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Sep. 30, 2017 $ / shares	Mar. 31, 2016 $ / shares shares
Class of Stock [Line Items]
Proceeds from issuance of Class A common shares | $					$ 0	$ 694,765	$ 102,830
Class A common shares/units
Class of Stock [Line Items]
Stock exchange ratio	1.4275
Issuance of class A common shares, net of offering costs (in shares)		13,800,000	14,842,982	36,546,170
Common shares, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01		$ 0.01	$ 0.01
Proceeds from issuance of Class A common shares | $		$ 312,000	$ 336,500
Stock issuance costs | $		$ 9,200	$ 400		$ 0	$ 10,637	$ 227
Class A Units | American Residential Properties Inc.
Class of Stock [Line Items]
Units outstanding (in shares)									1,343,843
Operating Partnership | Class A Units
Class of Stock [Line Items]
Stock exchange ratio					1
General partner ownership interest					84.30%
Percentage of units outstanding						83.80%
Units outstanding (in shares)					351,966,447	342,099,865
Operating Partnership | Class A Units | American Residential Properties Inc.
Class of Stock [Line Items]
Percentage of units outstanding					0.30%
Units outstanding (in shares)						1,073,509

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