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Summary of Significant Accounting Policies (Details 8)
 12 Months Ended
Dec. 31, 2013
facility
segment
Dec. 31, 2012
Dec. 31, 2011
Nov. 02, 2013
Stock-Based Compensation        
Time period of historical volatility of stock used to estimate expected volatility 6 years 6 months 25 days      
Expected dividend yield assumption (as a percent) 0.00%      
Weighted-average assumptions used in the Black-Scholes option-pricing model        
Risk-free interest rate (as a percent) 1.08% 0.84% 1.04%  
Expected volatility (as a percent) 46.27% 45.78% 47.60%  
Weighted-average expected life 6 years 6 months 25 days 6 years 7 months 20 days 5 years 9 months 25 days  
Segment Information        
Number of reportable segments 3      
Ownership interest in joint venture (as a percent)       50.00%
Certain Risks and Uncertainties        
Number of facilities in terms of net revenues that will face new significant competition in the near term 2      
Number of facilities located in Charles Town, West Virginia that will face new significant competition in the near term 1      
Number of facilities located in Grantville, Pennsylvania that will face new significant competition in the near term 1      
Kansas
        
Segment Information        
Ownership interest in joint venture (as a percent) 50.00%