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Fair Value Measurements (Narrative) (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Non-recurring fair value measurements [Abstract] |  |  |
Diversification of share awards within deferred compensation plan (Equity) | $ 951 | $ 2,627 | $ 23,200
Number of Operating properties Acquired | 2 |  |

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- Definition Non-qualified share awards diversified into other equity securities during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Non-recurring fair value measurements [Abstract] + References No definition available. + Details
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Namespace Prefix: | cpt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of operating properties acquired which are now fully consolidated during the period. + References No definition available. + Details
Name: | cpt_NumberofOperatingpropertiesAcquired
Namespace Prefix: | cpt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration