Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Detail)

v3.3.0.814
Long-Term Debt (Detail) - USD ($)
$ in Thousands
9 Months Ended
Mar. 17, 2015
Sep. 18, 2014
May. 06, 2014
Nov. 05, 2013
Feb. 04, 2013
Nov. 19, 2012
Sep. 30, 2015
Sep. 30, 2014
Oct. 26, 2015
Dec. 31, 2014
Long- term Debt                    
Net unamortized premium             $ 6,777     $ 7,550
Long-term debt             4,406,777     4,362,550
Loss on Early Extinguishment of Debt               $ (20,386)    
Midstream Credit Facility Member                    
Long- term Debt                    
Bank credit facility long-term debt             525,000      
Maximum amount of the Credit Facility             $ 1,500,000      
Weighted average interest rate (as a percent)             1.70%      
Midstream Credit Facility Member | Minimum                    
Long- term Debt                    
Commitment fees on the unused portion (as a percent)             0.25%      
Midstream Credit Facility Member | Maximum                    
Long- term Debt                    
Commitment fees on the unused portion (as a percent)             0.375%      
Bank credit facility                    
Long- term Debt                    
Bank credit facility long-term debt             $ 500,000     $ 1,730,000
Current borrowing base             4,000,000      
Lender commitments             $ 4,000,000      
Weighted average interest rate (as a percent)             2.02%     2.06%
Outstanding letters of credit             $ 535,000     $ 387,000
Bank credit facility | Subsequent event                    
Long- term Debt                    
Current borrowing base                 $ 4,500,000  
Lender commitments                 $ 4,000,000  
Bank credit facility | Minimum                    
Long- term Debt                    
Commitment fees on the unused portion (as a percent)             0.375%      
Bank credit facility | Maximum                    
Long- term Debt                    
Commitment fees on the unused portion (as a percent)             0.50%      
6.00% senior notes due 2020                    
Long- term Debt                    
Long-term notes payable             $ 525,000     525,000
Interest rate (as a percent)           6.00%        
Senior notes issued         $ 225,000 $ 300,000        
Issue price as percentage of par value         103.00% 100.00%        
Percentage of principal amount at which notes may be required to be repurchased in event of change of control             101.00%      
6.00% senior notes due 2020 | On or after December 1, 2018                    
Long- term Debt                    
Redemption price             100.00%      
6.00% senior notes due 2020 | On or before December 1, 2015                    
Long- term Debt                    
Redemption price             104.50%      
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings             35.00%      
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)             106.00%      
6.00% senior notes due 2020 | Prior to December 1, 2015                    
Long- term Debt                    
Redemption price             100.00%      
5.375% senior notes due 2021                    
Long- term Debt                    
Long-term notes payable             $ 1,000,000     1,000,000
Interest rate (as a percent)       5.375%            
Senior notes issued       $ 1,000,000            
Issue price as percentage of par value       100.00%            
5.375% senior notes due 2021 | On or after November 1, 2016                    
Long- term Debt                    
Redemption price             104.031%      
5.375% senior notes due 2021 | On or after November 1, 2019                    
Long- term Debt                    
Redemption price             100.00%      
5.375% senior notes due 2021 | On or before November 1, 2016                    
Long- term Debt                    
Redemption price             100.00%      
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings             35.00%      
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)             105.375%      
5.375% senior notes due 2021 | Prior to May 1, 2015                    
Long- term Debt                    
Percentage of principal amount at which notes may be required to be repurchased in event of change of control             101.00%      
Stand-alone revolving note                    
Long- term Debt                    
Maximum amount of the Credit Facility             $ 25,000      
Outstanding balance             $ 0      
Stand-alone revolving note | Lender's Prime Rate                    
Long- term Debt                    
Basis spread on variable rate (as a percent)             1.00%      
5.125% senior notes due 2022                    
Long- term Debt                    
Long-term notes payable             $ 1,100,000     $ 1,100,000
Interest rate (as a percent)     5.125%              
Senior notes issued   $ 500,000 $ 600,000              
Issue price as percentage of par value   100.50% 100.00%              
5.125% senior notes due 2022 | On or after June 1, 2017                    
Long- term Debt                    
Redemption price             103.844%      
5.125% senior notes due 2022 | On or before June 1, 2017                    
Long- term Debt                    
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings             35.00%      
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)             105.125%      
5.125% senior notes due 2022 | Prior to June 1, 2017                    
Long- term Debt                    
Redemption price             100.00%      
5.125% senior notes due 2022 | On or after June 1, 2020                    
Long- term Debt                    
Redemption price             100.00%      
5.125% senior notes due 2022 | Prior to December 1, 2015                    
Long- term Debt                    
Redemption price of the debt instrument in the event of change of control (as a percent)             110.00%      
Percentage of principal amount at which notes may be required to be repurchased in event of change of control             101.00%      
5.625% senior notes due 2023                    
Long- term Debt                    
Long-term notes payable             $ 750,000      
Interest rate (as a percent) 5.625%                  
Senior notes issued $ 750,000                  
Issue price as percentage of par value 100.00%                  
Redemption price of the debt instrument in the event of change of control (as a percent)             110.00%      
Percentage of principal amount at which notes may be required to be repurchased in event of change of control             101.00%      
5.625% senior notes due 2023 | On Or After June 1, 2018                    
Long- term Debt                    
Redemption price             104.219%      
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings             35.00%      
5.625% senior notes due 2023 | On Or After June 1, 2021                    
Long- term Debt                    
Redemption price             100.00%      
5.625% senior notes due 2023 | Prior To June 1, 2018                    
Long- term Debt                    
Redemption price             100.00%      
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)             105.625%