Value of real estate assets, at cost, as of the balance sheet date that are subject to secured notes payable.

No definition available.

Name:	cpt_ValueOfRealEstateAssetsAtCostSubjectToSecuredNotes
Namespace Prefix:	cpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

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Notes Payable (Summary Of Indebtedness) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Oct. 04, 2018	Oct. 02, 2018	Dec. 31, 2017
Unsecured Debt	$ 1,836,427			$ 1,338,628
Secured notes payable	485,176			865,970
Total notes payable	2,321,600			2,204,600
Value Of Real Estate Assets At Cost Subject To Secured Notes	867,900			1,534,900
Senior Unsecured Notes [Member]
Unsecured Debt	1,736,800			1,338,600
Term loan Due 2022 \| Unsecured Debt [Member]
Unsecured Debt	99,600			0
4.78% Notes Due 2021 \| Senior Unsecured Notes [Member]
Unsecured Debt	$ 249,100			248,700
Notes payable, effective interest rate	4.78%
Debt Instrument, Maturity Date	Jun. 15, 2021
3.15% Notes Due 2022 \| Senior Unsecured Notes [Member]
Unsecured Debt	$ 347,300			346,600
Notes payable, effective interest rate	3.15%
Debt Instrument, Maturity Date	Dec. 15, 2022
5.07% Notes Due 2023 \| Senior Unsecured Notes [Member]
Unsecured Debt	$ 248,000			247,600
Notes payable, effective interest rate	5.07%
Debt Instrument, Maturity Date	Jun. 15, 2023
4.36% Notes Due 2024 \| Senior Unsecured Notes [Member]
Unsecured Debt	$ 248,700			248,500
Notes payable, effective interest rate	4.36%
Debt Instrument, Maturity Date	Jan. 15, 2024
3.68% Notes Due 2024 \| Senior Unsecured Notes [Member]
Unsecured Debt	$ 247,600			247,200
Notes payable, effective interest rate	3.68%
Debt Instrument, Maturity Date	Sep. 15, 2024
3.74% Notes Due 2028 \| Unsecured Debt [Member]
Notes payable, effective interest rate			4.113%
3.74% Notes Due 2028 \| Senior Unsecured Notes [Member]
Unsecured Debt	$ 396,100			0
Notes payable, effective interest rate	3.74%
Debt Instrument, Maturity Date	Oct. 15, 2028
Secured Notes 4.38% to 5.33% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] \| Secured Debt [Member]
Secured notes payable	$ 485,200			866,000
Secured Notes 1.92% Floating Rate [Member] \| Secured Debt [Member]
Secured notes payable	$ 0	$ 175,000		$ 175,000
Minimum [Member] \| Term loan Due 2022 \| Unsecured Debt [Member]
Notes payable, effective interest rate	3.34%
Minimum [Member] \| Secured Notes 4.38% to 5.33% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] \| Secured Debt [Member]
Notes payable, effective interest rate	4.38%
Debt Instrument, Maturity Date	May 01, 2019
Minimum [Member] \| Secured Notes 1.92% Floating Rate [Member] \| Secured Debt [Member]
Notes payable, effective interest rate	1.92%
Maximum [Member] \| Secured Notes 4.38% to 5.33% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] \| Secured Debt [Member]
Notes payable, effective interest rate	5.33%
Debt Instrument, Maturity Date	Sep. 01, 2045
Short-term Debt [Member]
Debt Instrument, Maturity Date	May 14, 2018
Unsecured Credit Facility [Member] \| Commercial Banks [Member]
Unsecured Debt	$ 0