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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
Carrying Value $ 2,743.1us-gaap_NotesPayable $ 2,743.5us-gaap_NotesPayable  
Fixed rate notes payable      
Carrying Value 2,533.7us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember		 2,533.8us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember		  
Estimated Fair Value 2,687.1us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember		 2,666.1us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FixedRateNotesPayableMember		  
Floating rate notes payable      
Carrying Value 209.4us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember		 209.7us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember		 270.9us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember
Estimated Fair Value $ 202.5us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember		 $ 203.7us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= cpt_FloatingRateNotesPayableMember