Agreement effective date.

No definition available.

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- Definition

Date through which commodity derivatives cover oil and natural gas production for Trust.

+ References

No definition available.

+ Details

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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Derivatives - Additional Information (Details) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended
Derivatives - Additional Information (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss (gain) on derivative contracts	$ 47,123,000	$ (241,419,000)	$ (44,075,000)
Interest expense	270,234,000us-gaap_InterestAndDebtExpense	303,349,000us-gaap_InterestAndDebtExpense	237,332,000us-gaap_InterestAndDebtExpense
Mississippian Trust I
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative agreement effective date	Apr. 01, 2011
Commodity derivative contracts covering volumes of oil and gas production, date	Dec. 31, 2015
Permian Trust
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative agreement effective date	Aug. 01, 2011
Commodity derivative contracts covering volumes of oil and gas production, date	Mar. 31, 2015
Mississippian Trust II
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative agreement effective date	Apr. 01, 2012
Commodity derivative contracts covering volumes of oil and gas production, date	Dec. 31, 2014
Senior Floating Rate Notes due 2014 \| Fixed To Floating Interest Rate Swap Through April 1st 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, maturity date				Apr. 01, 2013
Derivative liability, notional amount				350,000,000
Derivative, fixed interest rate				6.69%
Commodity Derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss (gain) on derivative contracts	47,100,000	(241,400,000)	(44,100,000)		(22,900,000)	132,800,000	(103,700,000)	40,900,000	(19,600,000)	193,500,000	(669,900,000)	254,600,000
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense	10,000	1,200,000	3,200,000
Cash \| Commodity Derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss (gain) on derivative contracts	(3,200,000)	(100,700,000)	37,600,000
Cash \| Commodity Derivatives \| Derivative Contracts Early Settlements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss (gain) on derivative contracts	29,600,000
Cash \| Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense	2,400,000	9,200,000	9,400,000
Noncash \| Commodity Derivatives \| Amendment
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss (gain) on derivative contracts		$ 117,100,000