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Other Contingencies (Details)
1 Months Ended 6 Months Ended
Oct. 01, 2011
Jan. 31, 2013
Jun. 30, 2015
USD ($)
financial_covenant
state
Jul. 09, 2015
USD ($)
Jul. 01, 2015
USD ($)
Short-term Debt [Line Items]          
Bank line of credit     $ 125,000,000    
Borrowings under line of credit     0    
Reduction of bank line of credit     $ 73,697,000    
Number of financial covenants | financial_covenant     1    
Credit line, term     5 years    
Line of credit expiration date     Dec. 18, 2018    
Number of states in which entity operates | state     48    
Percentage of reduction to Medicare payments to nursing centers 11.10%        
Standby Letter Of Credit          
Short-term Debt [Line Items]          
Irrevocable standby letter of credit, outstanding     $ 73,697,000    
Maximum          
Short-term Debt [Line Items]          
Percentage of reduction of Medicare payments to plans and providers   2.00%      
Subsequent Event          
Short-term Debt [Line Items]          
Bank line of credit       $ 200,000,000  
Subsequent Event | Standby Letter Of Credit          
Short-term Debt [Line Items]          
Irrevocable standby letter of credit, outstanding         $ 75,978,000