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Shareholders' Equity / Partners' Capital - Class A Common Shares (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Class of Stock [Line Items]            
Proceeds from issuance of Class A common shares | $       $ 694,765 $ 102,830 $ 0
Class A common shares/units            
Class of Stock [Line Items]            
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   $ 10,637 $ 227 $ 0
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    
Percentage of units outstanding       83.80% 81.40%  
Units outstanding (in shares)       342,099,865 298,931,517  
Operating Partnership | Class A Units | American Residential Properties Inc.            
Class of Stock [Line Items]            
Percentage of units outstanding       0.30% 0.40%  
Units outstanding (in shares)       1,073,509 1,279,316