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Vessels (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 20, 2013 Hercules Container Carrier Sa | Mar. 27, 2013 Iason Container Carrier Sa | Jun. 30, 2012 M/T Attikos | Jun. 30, 2012 M/T Aristofanis | Dec. 22, 2012 M/V Agamemnon | Dec. 22, 2012 M/V Archimidis
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of vessels acquired |  |  |  |  | $ 54,000 | $ 54,000 |  |  | $ 68,000 | $ 65,000
Date of vessel sale |  |  |  |  |  |  | Feb. 14, 2012 | Apr. 04, 2012 |  |
DWT |  |  |  |  |  |  | 12,000 | 12,000 |  |
Year built |  |  |  |  |  |  | 2005 | 2005 |  |
Net proceeds from sale of vessel | 0 | 19,675 |  |  |  |  | 9,807 | 9,868 |  |
Gain on vessel disposal | 0 | 1,296 |  |  |  |  | 943 | 353 |  |
Vessel carrying value | $ 1,042,900 |  | $ 959,550 | $ 1,073,986 |  |  | $ 8,864 | $ 9,514 |  |

X
- Definition The fair value of the vessel at the time of the acquisition. + References No definition available. + Details
Name: | cplp_BusinessAcquisitionVesselsFairValue
Namespace Prefix: | cplp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash proceeds net of commissions and expenses from the sale of vessels. + References No definition available. + Details
Name: | cplp_ProceedsFromSaleOfVessel
Namespace Prefix: | cplp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The vessel's size in DWT. + References No definition available. + Details
Name: | cplp_VesselCapacity
Namespace Prefix: | cplp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents vessels' book value, net of accumulated depreciation. + References No definition available. + Details
Name: | cplp_VesselsNet
Namespace Prefix: | cplp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The year that the vessel was built. + References No definition available. + Details
Name: | cplp_VesselYearBuilt
Namespace Prefix: | cplp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date of acquisition or disposal, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsDateOfTransactionForAcquisitionsOrDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration