Long-term Debt - Schedule of Long-term Instruments (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Jun. 30, 2015
Jun. 18, 2011
Jan. 03, 2012
Sep. 28, 2012
Debt Instrument [Line Items]                  
Long-term debt   $ 2,146,599,000 $ 2,198,148,000            
Current portion of long-term debt   (80,892,000) (69,813,000)            
Total long-term debt, net   2,065,707,000 2,128,335,000            
Letters of Credit Outstanding, Amount   34,300,000              
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   80,892,000              
Long-term Debt, Maturities, Repayments of Principal in Year Two   191,996,000              
Long-term Debt, Maturities, Repayments of Principal in Year Three   51,499,000              
Long-term Debt, Maturities, Repayments of Principal in Year Four   54,582,000              
Long-term Debt, Maturities, Repayments of Principal in Year Five   19,135,000              
Long-term Debt, Maturities, Repayments of Principal after Year Five   1,802,584,000              
Long-term Debt, Gross   2,200,688,000              
Loss on extinguishment of debt (146,800,000) (4,132,000) (146,787,000) (51,796,000)          
Accretion (Amortization) of Discounts, Long-term Debt   (54,089,000)              
Payments of Financing Costs     35,900,000            
7.50% Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   494,682,000 494,041,000            
Debt Instrument, Interest Rate Terms   Fixed rate              
Debt Instrument, Interest Rate, Stated Percentage   7.50% 7.50%            
Unamortized discount on long-term debt   5,300,000 6,000,000            
Long-term debt, aggregate principal amount   500,000,000              
Restructured Land Loan [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   106,783,000 99,820,000            
Debt Instrument, Interest Rate at Period End   3.67% 3.67%            
Unamortized discount on long-term debt   6,700,000 10,700,000            
Long-term debt, aggregate principal amount   105,000,000              
Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Unused Borrowing Capacity, Amount   315,700,000              
Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   1,503,831,000 1,561,415,000            
Description of variable interest rate basis   LIBOR or base rate              
Debt Instrument, Interest Rate at Period End   4.25% 5.00%            
Unamortized discount on long-term debt   42,100,000 51,400,000            
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   0 0            
Description of variable interest rate basis   LIBOR or base rate              
Other Long-term Debt [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   41,303,000 42,872,000            
Unamortized discount on long-term debt   0 0            
Long-term Debt, weighted average interest rate   3.98% 3.93%            
Propco [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             1,575,000,000    
Propco [Member] | Tranche B-1 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             200,000,000    
Propco [Member] | Tranche B-2 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             750,000,000    
Propco [Member] | Tranche B-3 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             625,000,000 625,000,000  
Propco [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount               625,000,000  
Propco [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity             125,000,000    
Opco and GVR [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount                 575,000,000
Opco and GVR [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity                 200,000,000
Opco [Member]                  
Debt Instrument [Line Items]                  
Loss on extinguishment of debt       51,800,000          
Opco [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             435,700,000    
Opco [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity             25,000,000    
GVR Lenders [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity             10,000,000    
GVR Lenders [Member] | First Lien Term Loan [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             215,000,000    
GVR Lenders [Member] | Second Lien Term Loan [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount             90,000,000    
Restructured Land Loan [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Description of variable interest rate basis   LIBOR or base rate              
Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Interest coverage ratio   3.40              
Line of Credit Facility, Limit on Additional Credit Facility Commitments   350,000,000              
Ratio of Indebtedness to Net Capital   5.02              
Credit Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Multiple of Pro Forma First Lien Leverage   4.5              
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.50%              
Revolving credit facility, maximum borrowing capacity   350,000,000              
Revolving Credit Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Interest coverage ratio   2.50              
Ratio of Indebtedness to Net Capital   5              
Revolving Credit Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Interest coverage ratio   3              
Ratio of Indebtedness to Net Capital   7.00              
Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity   1,625,000,000.000              
Line of Credit Facility, Periodic Payment, Percent of Principal   0.25%              
Loss on extinguishment of debt   (4,100,000)              
Payments of Financing Costs   2,400,000              
Write-off of Unamortized Debt Discount and Debt Issuance Costs   1,700,000              
Term Loan Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Ratio of Indebtedness to Net Capital   3.5              
Term Loan Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Ratio of Indebtedness to Net Capital   4.5              
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   3.50%              
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   3.25%              
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum   1.00%              
Base Rate [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   2.50%              
Base Rate [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate         2.25%        
Debt Instrument, Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage   105.625%              
Debt Instrument, Redemption, Period One [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage   101.00%              
Leverage Ratio Above 4.50 [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Prepayment, Percentage of Excess Cash Flow   50.00%              
Leverage Ration less than or equal to 4.50 [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Periodic Payment, Percent of Principal   25.00%              
Leverage Ratio less than or equal to 3.50 [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Prepayment, Percentage of Excess Cash Flow   0.00%              
Subsequent Event [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Repayments of Long-term Debt           $ 61,000,000