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Financial Instruments - Additional Information (Details) | Jun. 30, 2018 | Jun. 30, 2017
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Account for more than 10% of the partnership's revenue |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |
Number of customers | 3 | 4

X
- Definition The number of customers. + References No definition available. + Details
Name: | cplp_NumberOfCustomers
Namespace Prefix: | cplp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_MajorCustomersAxis=cplp_GroupOfCustomersThatAccountForMoreThan10PercentOfRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |