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Acquisitions - Additional Information (Detail)
$ in Millions
6 Months Ended 12 Months Ended
May. 29, 2015
USD ($)
Community
Independent_Living_Unit
Assisted_Living_Unit
May. 21, 2015
USD ($)
Community
Assisted_Living_Unit
Mar. 27, 2015
USD ($)
Community
Independent_Living_Unit
Assisted_Living_Unit
Jan. 13, 2015
USD ($)
Community
Assisted_Living_Unit
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]            
Additions to property and equipment         $ 68.7 $ 146.1
Finite lived intangible asset acquired in place leases during period         $ 6.1  
Baytown Transaction [Member]            
Business Acquisition [Line Items]            
Number of acquisition closed | Community     1      
Acquisition cost     $ 29.6      
Number of independent living units | Independent_Living_Unit     9      
Number of assisted living units | Assisted_Living_Unit     120      
Transaction cost of acquisition     $ 0.1      
Long term finance     $ 21.4      
Long term fixed interest rate     3.55%      
Maximum period for expansion of permanent financing     10 years      
Green Bay Transaction [Member]            
Business Acquisition [Line Items]            
Number of acquisition closed | Community       1    
Acquisition cost       $ 18.3    
Number of assisted living units | Assisted_Living_Unit       78    
Transaction cost of acquisition       $ 0.1    
Long term finance       $ 14.1    
Long term fixed interest rate       4.35%    
Maximum period for expansion of permanent financing       10 years    
Heritage Transaction [Member]            
Business Acquisition [Line Items]            
Number of acquisition closed | Community 1          
Acquisition cost $ 14.9          
Number of independent living units | Independent_Living_Unit 64          
Number of assisted living units | Assisted_Living_Unit 44          
Transaction cost of acquisition $ 0.2          
Long term finance $ 11.2          
Long term fixed interest rate 4.79%          
Maximum period for expansion of permanent financing 10 years          
Emerald Transaction [Member]            
Business Acquisition [Line Items]            
Number of acquisition closed | Community   2        
Acquisition cost   $ 12.0        
Number of assisted living units | Assisted_Living_Unit   79        
Transaction cost of acquisition   $ 0.1        
Long term finance   $ 9.2        
Long term fixed interest rate   4.55%        
Maximum period for expansion of permanent financing   10 years