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No authoritative reference available. false 6 Natural gas liquids sales 3 cpno_NaturalGasLiquidsSales cpno false credit duration Midstream natural gas activities consisting of the sale of natural gas liquids. false false false false false false false false false false false verboselabel false 1 false true false false 118999000 118999 false false false 2 false true false false 99098000 99098 false false false 3 false true false false 353119000 353119 false false false 4 false true false false 271392000 271392 false false false xbrli:monetaryItemType monetary Midstream natural gas activities consisting of the sale of natural gas liquids. No authoritative reference available. false 7 Transportation, compression and processing fees 3 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 17909000 17909 false false false 2 false true false false 13926000 13926 false false false 3 false true false false 47539000 47539 false false false 4 false true false false 42838000 42838 false false false xbrli:monetaryItemType monetary Revenue related to midstream and downstream gas activities. May include the following: gathering from wells, processing to remove impurities, storage, transmission, and the sale of natural gas and related products. No authoritative reference available. false 8 Condensate and other 3 cpno_CondensateAndOther cpno false credit duration Midstream activities consisting of the sale of condensate and income from other midstream related activities that does not... false false false false false false false false false false false totallabel false 1 false true false false 13272000 13272 false false false 2 false true false false 9760000 9760 false false false 3 false true false false 41204000 41204 false false false 4 false true false false 30319000 30319 false false false xbrli:monetaryItemType monetary Midstream activities consisting of the sale of condensate and income from other midstream related activities that does not qualify for separate disclosure on the income statement under materiality guidelines. No authoritative reference available. true 9 Total revenue 3 us-gaap_Revenues us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 237704000 237704 false false false 2 false true false false 189531000 189531 false false false 3 false true false false 734421000 734421 false false false 4 false true false false 570792000 570792 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 10 Costs and expenses: 2 us-gaap_OperatingCostsAndExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 11 Cost of natural gas and natural gas liquids (1) 3 us-gaap_NaturalGasMidstreamCosts us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 174461000 174461 false false false 2 false true false false 129617000 129617 false false false 3 false true false false 551939000 551939 false false false 4 false true false false 395114000 395114 false false false xbrli:monetaryItemType monetary Cost of residue gas, natural gas liquids and condensate. Midstream is a term sometimes used to those industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). The term is most often applied to pipeline transportation of crude oil and natural gas. No authoritative reference available. false 12 Transportation (1) 3 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5340000 5340 false false false 2 false true false false 6484000 6484 false false false 3 false true false false 16619000 16619 false false false 4 false true false false 18211000 18211 false false false xbrli:monetaryItemType monetary Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products. No authoritative reference available. false 13 Operations and maintenance 3 cpno_OperationAndMaintenanceExpenses cpno false debit duration Expenses incurred for the administration, supervision, operation, maintenance, preservation and protection of the entity's... false false false false false false false false false false false verboselabel false 1 false true false false 13004000 13004 false false false 2 false true false false 13202000 13202 false false false 3 false true false false 38337000 38337 false false false 4 false true false false 38764000 38764 false false false xbrli:monetaryItemType monetary Expenses incurred for the administration, supervision, operation, maintenance, preservation and protection of the entity's assets. No authoritative reference available. false 14 Depreciation and amortization 3 us-gaap_DepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 15218000 15218 false false false 2 false true false false 14575000 14575 false false false 3 false true false false 46002000 46002 false false false 4 false true false false 41071000 41071 false false false xbrli:monetaryItemType monetary The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 15 General and administrative 3 us-gaap_GeneralAndAdministrativeExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 9869000 9869 false false false 2 false true false false 9200000 9200 false false false 3 false true false false 31311000 31311 false false false 4 false true false false 29246000 29246 false false false xbrli:monetaryItemType monetary The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No authoritative reference available. false 16 Taxes other than income 3 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1315000 1315 false false false 2 false true false false 836000 836 false false false 3 false true false false 3658000 3658 false false false 4 false true false false 2349000 2349 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. false 17 Equity in earnings from unconsolidated affiliates 3 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -2049000 -2049 false false false 2 false true false false -2529000 -2529 false false false 3 false true false false 19788000 19788 false false false 4 false true false false -6112000 -6112 false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. 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No authoritative reference available. true 19 Operating income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 20546000 20546 false false false 2 false true false false 18146000 18146 false false false 3 false true false false 26767000 26767 false false false 4 false true false false 52149000 52149 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. false 20 Other income (expense): 2 us-gaap_OtherNonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 21 Interest and other income 3 cpno_InterestAndOtherIncome cpno false credit duration Interest income and other nonoperating income which does not qualify for separate disclosure on the income statement under... false false false false false false false false false false false verboselabel false 1 false true false false 15000 15 false false false 2 false true false false 1065000 1065 false false false 3 false true false false 59000 59 false false false 4 false true false false 1119000 1119 false false false xbrli:monetaryItemType monetary Interest income and other nonoperating income which does not qualify for separate disclosure on the income statement under materiality guidelines. No authoritative reference available. false 22 Gain on retirement of unsecured debt 3 us-gaap_GainsLossesOnExtinguishmentOfDebt us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0     false false false 2 false false false false 0 0     false false false 3 false false false false 0 0     false false false 4 false true false false 3939000 3939 false false false xbrli:monetaryItemType monetary Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 true 24 Income (loss) before income taxes and discontinued operations 2 cpno_IncomeLossFromContinuingOperationsBeforeIncomeTaxes cpno false credit duration Represents the equity's income or loss from operations before income taxes and discontinued operations. false false false false false false false false false false false verboselabel false 1 false true false false 7618000 7618 false false false 2 false true false false 3771000 3771 false false false 3 false true false false -14413000 -14413 false false false 4 false true false false 15318000 15318 false false false xbrli:monetaryItemType monetary Represents the equity's income or loss from operations before income taxes and discontinued operations. No authoritative reference available. false 25 Provision for income taxes 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -320000 -320 false false false 2 false true false false -304000 -304 false false false 3 false true false false -660000 -660 false false false 4 false true false false -1039000 -1039 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 28 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph b(1) false 27 Discontinued operations, net of tax (Note 13) 2 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0     false false false 2 false true false false 262000 262 false false false 3 false false false false 0 0     false false false 4 false true false false 1393000 1393 false false false xbrli:monetaryItemType monetary This element represents the overall income (loss) from a disposal group apportioned to the parent that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes after deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 28 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph b(2) true 28 Net income (loss) 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 7298000 7298 false false false 2 false true false false 3729000 3729 false false false 3 false true false false -15073000 -15073 false false false 4 false true false false 15672000 15672 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) true 29 Preferred unit distributions 2 cpno_PreferredUnitDistributions cpno false debit duration The amount of distributions declared or paid in the period to preferred unitholders, or the amount for which the obligation... false false false false false false false false false false true negatedtotal false 1 false true false false -7500000 -7500 false false false 2 false false false false 0 0     false false false 3 false true false false -7500000 -7500 false false false 4 false false false false 0 0     false false false xbrli:monetaryItemType monetary The amount of distributions declared or paid in the period to preferred unitholders, or the amount for which the obligation to pay the distributions arose in the period. No authoritative reference available. true 30 Net (loss) income to common units 2 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false -202000 -202 false false false 2 true true false false 3729000 3729 false false false 3 true true false false -22573000 -22573 false false false 4 true true false false 15672000 15672 false false false xbrli:monetaryItemType monetary Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 36 Diluted net (loss) income per common unit: 2 cpno_DilutedEarningsPerUnitAbstract cpno false na duration Diluted earnings per unit abstract false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Diluted earnings per unit abstract false 37 (Loss) income per common unit from continuing operations 3 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel true 1 false false false false 0 0     false false false 2 true true false false 0.06 0.06 false false false 3 true true false false -0.36 -0.36 false false false 4 true true false false 0.25 0.25 false false false us-types:perShareItemType decimal The amount of income (loss) from continuing operations available to each share of common stock outstanding during the reporting period and each share that would have been outstanding assuming the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 false 38 Income per common unit from discontinued operations 3 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare us-gaap true na duration No definition available. false false false false false false false false false false false totallabel true 1 false false false false 0 0     false false false 2 false false false false 0 0     false false false 3 false false false false 0 0     false false false 4 true true false false 0.02 0.02 false false false us-types:perShareItemType decimal The amount of income (loss) from discontinued operations, net of related tax effect, per each diluted share of common stock outstanding during the reporting period. 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