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Fair Value Measurements (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Carrying Value $ 2,743.5us-gaap_NotesPayable $ 2,530.8us-gaap_NotesPayable
Fixed Rate Notes Payable [Member]    
Carrying Value 2,533.8us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember		 2,319.5us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember
Estimated Fair Value 2,666.1us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember		 2,391.5us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember
Floating Rate Notes Payable [Member]    
Carrying Value 209.7us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember		 211.3us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember
Estimated Fair Value $ 203.7us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember		 $ 201.4us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember