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Income Taxes (Schedule of Per Share Distributions Reported to Shareholders) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Document Fiscal Year Focus	2014
Ordinary Income	$ 1.23cpt_TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	$ 1.40cpt_TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	$ 0.96cpt_TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends
Long-term capital gain	$ 1.02cpt_TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	$ 0.76cpt_TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	$ 0.64cpt_TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain
Unrecaptured Sec. 1250 gain	$ 0.39cpt_TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	$ 0.36cpt_TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	$ 0.64cpt_TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain
Total common share distributions	$ 2.64us-gaap_CommonStockDividendsPerShareDeclared	$ 2.52us-gaap_CommonStockDividendsPerShareDeclared	$ 2.24us-gaap_CommonStockDividendsPerShareDeclared
Percentage Of Distributions Representing Tax Preference Items	4.17%cpt_PercentageOfIncomeDistributionsRepresentingTaxPreferenceItems	4.95%cpt_PercentageOfIncomeDistributionsRepresentingTaxPreferenceItems	5.72%cpt_PercentageOfIncomeDistributionsRepresentingTaxPreferenceItems

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- Definition

Percentage of income distributions representing tax preference items.

+ References

No definition available.

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- Definition

Gain from a qualifying investment owned for longer than 12 months and then sold for a price greater than the purchase price. Taxes can be deferred until the sale of asset.

+ References

No definition available.

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- Definition

The cash outflow from distributions of an entity's earnings to common and preferred stockholders, including minority shareholders. Ordinary dividends are paid out of the earnings and profits of the entity and are taxed as ordinary income.

+ References

No definition available.

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- Definition

A type of depreciation-recapture income that is realized on the sale of depreciable real estate. Unrecaptured Section 1250 income is taxed at a 25% maximum capital gains rate (or in some cases less).

+ References

No definition available.

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- Definition

This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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