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Long-Term Debt - Narrative (Details) (USD $)
 0 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
Jan. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jan. 31, 2014
Secured Debt
Term loan, due 2021
Sep. 30, 2014
Secured Debt
Term loan, due 2021
Sep. 30, 2014
Secured Debt
Term loan, due 2021
Jan. 31, 2014
Senior Notes
5.250% senior unsecured notes, due 2022
Sep. 30, 2014
Senior Notes
5.250% senior unsecured notes, due 2022
Jan. 31, 2014
Senior Notes
5.625% senior unsecured notes, due 2024
Sep. 30, 2014
Senior Notes
5.625% senior unsecured notes, due 2024
Jan. 31, 2014
Long-term Debt
Sep. 30, 2014
Fair Value, Inputs, Level 2
Jan. 31, 2014
Revolving Credit Facility
Sep. 30, 2014
Revolving Credit Facility
Sep. 30, 2014
Revolving Credit Facility
Jan. 31, 2014
Letter of Credit
Dec. 31, 2014
Subsequent Event
Oct. 01, 2014
Subsequent Event
Oct. 02, 2014
Subsequent Event
Senior Notes
5.250% senior unsecured notes, due 2022
Oct. 01, 2014
Subsequent Event
Senior Notes
5.250% senior unsecured notes, due 2022
Oct. 01, 2014
Subsequent Event
Letter of Credit
Line of Credit Facility [Line Items]                                            
Maximum borrowing capacity                           $ 425,000,000     $ 80,000,000          
Credit facility, expiration date                           Jan. 31, 2019                
Cash adjustment to debt compliance calculation                             150,000,000 150,000,000            
Commitment fee for unused commitments                               1,400,000            
Outstanding letters of credit and surety bonds   99,300,000   78,300,000                     20,500,000 20,500,000           10,200,000
Covenant description   The Credit Agreement requires, in connection with the incurrence of certain indebtedness, that we maintain a Consolidated Total Leverage Ratio, which is the ratio of our consolidated total debt to our Consolidated EBITDA for the trailing four consecutive quarters, of no greater than 6.0 to 1.0.                           The Credit Agreement contains certain customary affirmative and negative covenants. As of September 30, 2014, the terms of the Revolving Credit Facility require that as an entity being taxed as a REIT, we are required to maintain a Maximum Consolidated Net Secured Leverage Ratio of no greater than 4.0 to 1.0.            
Maximum Consolidated Net Secured Leverage Ratio                               1.6            
Maximum consolidated net secured coverage ratio, REIT election                             4.0              
Debt Covenant, Consolidated Total Leverage Ratio   6.0                                        
Consolidated Total Leverage Ratio   3.9                                        
Debt Instrument [Line Items]                                            
Debt face amount         800,000,000     400,000,000   400,000,000                     150,000,000  
Maturity date         Jan. 31, 2021     Jan. 31, 2022   Jan. 31, 2024                        
Stated interest rate           2.25% 2.25% 5.25%   5.625%                     5.25%  
Adjustment to term loan reference rate to arrive at effective rate           plus the greater of the London Interbank Offered Rate (“LIBOR”) or 0.75%                                
Basis spread on variable rate             0.75%                              
Interest rate at period end           3.00% 3.00%                              
Debt discount           1,800,000 1,800,000                              
Deferred finance costs   29,300,000                                 10,800,000      
Payments of Capital Distribution   2,038,800,000 0                 1,500,000,000           109,500,000        
Net proceeds retained from incurrence of debt 50,000,000                                          
Long-term debt at fair value                         $ 1,600,000,000                  
Allowable early redemption percentage for senior notes                 35.00%   35.00%                 35.00%