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Long-Term Debt - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 13, 2015 USD ($) | Sep. 30, 2015 USD ($) financial_institution | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) financial_institution | Sep. 30, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Apr. 12, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage, guarantors |  |  |  | 100.00% |  |  |  |  |
Number of financial institutions | financial_institution |  | 18 |  | 18 |  |  |  |  |
Deferred financing costs |  | $ 33,600,000 |  | $ 33,600,000 |  |  |  |  |
Amortization of deferred financing costs |  | 1,600,000 | $ 1,600,000 | $ 5,500,000 | $ 4,800,000 |  |  |  |
Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from issuance of notes |  |  |  |  |  |  | $ 1,175,800,000 |  |
Redemption percentage (up to) |  |  |  | 35.00% |  |  |  |  |
Redemption term |  |  |  | 180 days |  |  |  |  |
Percentage of minimum outstanding principal amount (at least) |  |  |  | 65.00% |  |  |  |  |
Debt instrument, default in payment of interest, term |  |  |  | 30 days |  |  |  |  |
Event of default by payment default ($10.0 million or more) |  |  |  | $ 10,000,000.0 |  |  |  |  |
Event of default by final judgments (in excess of $10.0 million) |  |  |  | $ 10,000,000.0 |  |  |  |  |
Event of default by final judgments, payment term |  |  |  | 60 days |  |  |  |  |
Deferred financing costs |  | 25,900,000 |  | $ 25,900,000 |  |  |  |  | $ 29,300,000
Second Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extension of maturity date condition, retirement or refinancing of notes, term | 90 days |  |  |  |  |  |  |  |
Line of credit facility maximum increase to aggregate commitments | $ 1,700,000,000 |  |  |  |  |  |  | $ 2,000,000,000 |
Line of credit facility, maximum borrowing capacity | $ 1,525,000,000 |  |  |  |  |  |  | $ 1,500,000,000 |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  | $ 2,500,000,000 |  | $ 2,500,000,000 |  |  |  |  |
Commitment fee of borrowing base capacity not utilized |  | 0.375% |  |  |  |  |  |  |
Minimum current ratio (no less than) |  |  |  | 1.0 |  |  |  |  |
Line of credit facility, amount outstanding |  | $ 180,000,000 |  | $ 180,000,000 |  |  |  |  |
Outstanding letters of credit |  | 5,200,000 |  | 5,200,000 |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  | $ 1,339,800,000 |  | $ 1,339,800,000 |  |  |  |  |
Weighted average interest rate |  | 1.70% |  | 1.70% |  |  |  |  | 1.90%
Minimum [Member] | Second Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of the reserve value of assets as determined by reserve reports (at least 80%) |  |  |  | 80.00% |  |  |  |  |
Loan term |  |  |  | 1 month |  |  |  |  |
Ratio of EBITDAX to interest expense necessary to maintain covenants (no less than) |  |  |  | 2.5 |  |  |  |  |
Maximum [Member] | Second Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan term |  |  |  | 6 months |  |  |  |  |
2022 Notes [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal debt amount |  |  |  |  |  | $ 1,000,000,000.0 |  |  |
Stated interest rate |  |  |  |  |  | 6.875% |  |  |
Net proceeds from issuance of notes |  |  |  |  |  | $ 983,600,000 |  |  |
2019 Notes [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal debt amount |  |  |  |  |  |  | $ 400,000,000.0 |  |
Stated interest rate |  |  |  |  |  |  | 7.25% |  |
2021 Notes [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal debt amount |  |  |  |  |  |  | $ 400,000,000.0 |  |
Stated interest rate |  |  |  |  |  |  | 6.50% |  |
2023 Notes [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal debt amount |  |  |  |  |  |  | $ 400,000,000.0 |  |
Stated interest rate |  |  |  |  |  |  | 6.875% |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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