Indebtedness (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 04, 2014
Mar. 31, 2015
Dec. 31, 2014
Long-term debt and notes payable        
Total debt     $ 1,580,687,000 $ 1,552,976,000
Less: current maturities     11,060,000 10,874,000
Total long-term debt     1,569,627,000 1,542,102,000
Gross proceeds from issuance of additional notes 111,650,000      
Maturities of Long-Term Debt and Notes Payable        
April 1, 2015 - December 31, 2015     8,805,000  
2016     281,913,000  
2017     6,444,000  
2018     570,713,000  
2019     2,489,000  
2020 and beyond     710,323,000  
Loss recognized associated with refinancing activities 2,277,000      
Select        
Long-term debt and notes payable        
Less: current maturities     11,060,000 10,874,000
Total long-term debt     1,569,627,000 1,542,102,000
Gross proceeds from issuance of additional notes 111,650,000      
Maturities of Long-Term Debt and Notes Payable        
Loss recognized associated with refinancing activities 2,277,000      
6.375% senior notes        
Long-term debt and notes payable        
Interest rate of debt (as a percent) 6.375%   6.375% 6.375%
Total debt     711,408,000 711,465,000
Unamortized premiums     1,400,000 1,500,000
6.375% senior notes | Select        
Long-term debt and notes payable        
Interest rate of debt (as a percent) 6.375%   6.375% 6.375%
Total debt     711,400,000 711,500,000
Revolving loan        
Long-term debt and notes payable        
Total debt     100,000,000 60,000,000
Term loans        
Long-term debt and notes payable        
Total debt     749,490,000 775,996,000
Unamortized discounts     3,800,000 4,200,000
Term loans | Select        
Long-term debt and notes payable        
Principal prepayments from excess cash flow   26,900,000    
Maturities of Long-Term Debt and Notes Payable        
Loss recognized associated with refinancing activities 2,300,000      
Other        
Long-term debt and notes payable        
Total debt     $ 19,789,000 $ 5,515,000