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Delivery commitments contingent upon pipeline construction or modification.

+ References

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Maximum remaining terms of leases and concessions on undeveloped acreage.

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Transportation and gathering commitments contingent upon construction and modification.

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Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract.

+ References

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Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year.

+ References

No definition available.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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Period remaining on leases or concessions that will expire on undeveloped acreage, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 5

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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Line Items]
Rent expense under operating leases	$ 13.3us-gaap_LeaseAndRentalExpense	$ 13.1us-gaap_LeaseAndRentalExpense	$ 13.8us-gaap_LeaseAndRentalExpense
Minimum remaining terms of leases on undeveloped acreage, in years	3 years
Maximum remaining terms of leases on undeveloped acreage, in years	5 years
Hydraulic Fracturing
Commitments And Contingencies Disclosure [Line Items]
Contractual Obligation, Due in Next Twelve Months	$ 12.0
Minimum
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract	5 years
Minimum \| 2015
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification in bbls per day	10,000
Maximum
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract	20 years
Maximum \| 2015
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification in bbls per day	20,000
Maximum \| 2017
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification in bbls per day	30,000
Maximum \| 2018
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification in bbls per day	45,000
Natural Gas \| Minimum
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification	7,000
Natural Gas \| Maximum
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification	400,000
Ethane
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification	20,000
Propane
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification	20,000