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Contributions by AH LLC (Details)
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 12, 2014
single_family_property
property
$ / shares
shares
Jun. 14, 2013
USD ($)
shares
Jun. 11, 2013
shares
Feb. 28, 2013
USD ($)
$ / shares
shares
Feb. 28, 2013
USD ($)
single_family_property
$ / shares
Feb. 28, 2013
USD ($)
$ / shares
Feb. 28, 2013
USD ($)
property
$ / shares
Feb. 28, 2013
USD ($)
property
$ / shares
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Significant Acquisitions and Disposals                      
Formation of consolidated joint venture                     $ 500,000
Units issue to Sponsor, value                   $ 1,546,000 35,817,000
Other liabilities       $ 2,500,000 $ 2,500,000 $ 2,500,000 $ 2,500,000 $ 2,500,000      
Cost of improvement                 $ 13,800,000   13,800,000
Reduction to additional paid in capital                     $ 356,400,000
Adjustments to additional paid in capital, credit associated to properties acquired               19,600,000      
Adjustments to additional paid in capital related to issuance costs           8,000,000          
Change in par value of common stock value           6,000          
Decrease in advisory fee           9,800,000          
2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Number of properties         2,770   2,770        
Other liabilities       $ 7,625,000 $ 7,625,000 7,625,000 $ 7,625,000 $ 7,625,000      
Series C Convertible Units                      
Significant Acquisitions and Disposals                      
Increase in common units issued                 13,500,000    
Class B common shares                      
Significant Acquisitions and Disposals                      
Increase in common units issued                 $ 300,000    
AH LLC                      
Significant Acquisitions and Disposals                      
Number of properties | property 45                    
AH LLC | 2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Total consideration amount           $ 491,700,000          
Common shares issue to Sponsor per share (in dollars per share) | $ / shares       $ 15.50 $ 15.50 $ 15.50 $ 15.50 $ 15.50      
AH LLC | Class A Units                      
Significant Acquisitions and Disposals                      
Number of properties | single_family_property 45                    
Units issue to Sponsor (in shares) | shares 653,378                    
Common units issue to Sponsor per unit (in dollars per share) | $ / shares $ 17.11                    
AH LLC | Class A common shares                      
Significant Acquisitions and Disposals                      
Common shares issued to Sponsor in 2012 offering (in shares) | shares   705,167                  
Formation of consolidated joint venture   $ 11,300,000                  
AH LLC | Class B common shares                      
Significant Acquisitions and Disposals                      
Common shares issued to Sponsor in 2012 offering (in shares) | shares       634,408              
Units issue to Sponsor, value           $ 7,700,000          
AH LLC | Class B common shares | 2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Common shares issued to Sponsor in 2012 offering (in shares) | shares       634,408              
Operating Partnership | AH LLC | Class A Units                      
Significant Acquisitions and Disposals                      
Units issue to Sponsor (in shares) | shares     12,395,965                
Operating Partnership | AH LLC | Series C Convertible Units                      
Significant Acquisitions and Disposals                      
Formation of consolidated joint venture           378,800,000          
Operating Partnership | AH LLC | Series C Convertible Units | 2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Units issue to Sponsor (in shares) | shares       31,085,974              
Formation of consolidated joint venture           378,800,000          
Sponsor | Class A Units                      
Significant Acquisitions and Disposals                      
Common units issue to Sponsor per unit (in dollars per share) | $ / shares $ 17.11                    
Sponsor | Class B common shares | 2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Units issue to Sponsor, value           7,700,000          
Sponsor | Operating Partnership                      
Significant Acquisitions and Disposals                      
Net book value           386,500,000          
Sponsor | Operating Partnership | 2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Number of properties | property             2,770        
Net book value           386,500,000          
Period from January 1, 2013, to February 28, 2013 | 2,770 Property Contribution                      
Significant Acquisitions and Disposals                      
Number of properties | property               109      
Other liabilities       $ (558,000) $ (558,000) $ (558,000) $ (558,000) $ (558,000)