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Acquisitions and Dispositions Acquisitions and Dispositions - Alaska JV Acquisition (Details)
$ in Thousands
Dec. 12, 2014
shares
Jun. 14, 2013
shares
Jun. 11, 2013
USD ($)
single_family_property
shares
Alaska Joint Venture Acquisition      
Business Acquisition [Line Items]      
Acquired of membership interests     100.00%
Number of properties acquired | single_family_property     4,778
Percentage of properties leased as of acquisition date     75.00%
Estimated fair values of the net assets      
Land     $ 156,648
Buildings and improvements     740,396
Receivable for net cash flows prior to acquisition date     1,896
Value of in-place leases     5,547
Fair value of acquired assets     904,487
Estimated net monetary assets     13,000
Cash and cash equivalents     $ 23,000
Alaska Joint Venture Acquisition | Class A common shares      
Business Acquisition [Line Items]      
Issuance of common shares (in shares) | shares     43,609,394
AH LLC | Class A common shares      
Business Acquisition [Line Items]      
Issuance of common shares (in shares) | shares   705,167  
Class A Units | AH LLC      
Business Acquisition [Line Items]      
Issuance of units (in shares) | shares 653,378    
Class A Units | Operating Partnership | Alaska Joint Venture Acquisition      
Business Acquisition [Line Items]      
Issuance of units (in shares) | shares     12,395,965
Class A Units | Operating Partnership | AH LLC      
Business Acquisition [Line Items]      
Issuance of units (in shares) | shares     12,395,965