XML 25 R29.htm IDEA: XBRL DOCUMENT v3.2.0.727
Organization and Operations (Details)
Jun. 10, 2013
shares
Jun. 30, 2015
state
property
Dec. 31, 2014
property
Organization and operations      
Number of properties | property   37,491 34,599
Number of states | state   22  
Number of Properties Held for Sale | property   44  
Operating Partnership | Series D Convertible Units      
Organization and operations      
Units issued to AH LLC (in shares) 4,375,000    
Operating Partnership | Series E Convertible Units      
Organization and operations      
Units issued to AH LLC (in shares) 4,375,000