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Fair Value Measurements (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Carrying Value | $ 2,743.1 us-gaap_NotesPayable | $ 2,743.5 us-gaap_NotesPayable |
Fixed rate notes payable |  |  |
Carrying Value | 2,533.7 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cpt_FixedRateNotesPayableMember | 2,533.8 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cpt_FixedRateNotesPayableMember |
Estimated Fair Value | 2,687.1 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = cpt_FixedRateNotesPayableMember | 2,666.1 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = cpt_FixedRateNotesPayableMember |
Floating rate notes payable |  |  |
Carrying Value | 209.4 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cpt_FloatingRateNotesPayableMember | 209.7 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cpt_FloatingRateNotesPayableMember | 270.9 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cpt_FloatingRateNotesPayableMember
Estimated Fair Value | $ 202.5 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = cpt_FloatingRateNotesPayableMember | $ 203.7 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = cpt_FloatingRateNotesPayableMember |

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
Name: | us-gaap_NotesPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesPayableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cpt_FixedRateNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cpt_FloatingRateNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |