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Shareholders' Equity / Partners' Capital - Noncontrolling Interest Narrative (Details) - Class A Units - shares	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
American Residential Properties Inc.
Class of Stock [Line Items]
Units outstanding (in shares)			1,343,843
Operating Partnership
Class of Stock [Line Items]
Equity interest rate	83.80%	81.40%
Units outstanding (in shares)	342,099,865	298,931,517
Operating Partnership | American Residential Properties Inc.
Class of Stock [Line Items]
Equity interest rate	0.30%	0.40%
Units outstanding (in shares)	1,073,509	1,279,316
AH LLC
Class of Stock [Line Items]
Units owned (in shares)	54,276,644
AH LLC | Operating Partnership
Class of Stock [Line Items]
Equity interest rate	15.90%	18.20%

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+ References

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- Definition

The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04.16(b))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04.16(a))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB TOPIC 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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