Additional Debt Disclosures [Abstract]

No definition available.

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- Definition

The threshold applied for the rate at which used credit facility fees will be incurred.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The change in ownership percentage of equity investments during the period.

+ References

No definition available.

+ Details

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

- Definition

The amount of loans repaid during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of loans assumed from a business acquisition.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Number of Loans Refinanced, Count

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

The number of properties sold during the period.

+ References

No definition available.

+ Details

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- Definition

We are required to ensure that the total Restricted Payments (as defined in the Credit Agreement) in an aggregate amount in any fiscal year does not exceed the amount of Restricted Payments required in order for us to (i) maintain our REIT status and (ii) avoid the payment of federal or state income or excise tax. Restricted Payments include quarterly dividends and the total amount of shares repurchased by us, if any, in excess of $100.0 million per year.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ 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 210.9-03.13,16)
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Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fees associated with providing collateral for the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCollateralFeesAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Definition

Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ Details

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

- Definition

Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

+ References

No definition available.

+ Details

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

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Glossary Financing Activities
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- Details

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- Details

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- Details

Name:	cpa17_CreditFacilityFeatureAxis=cpa17_AccordionMember
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- Details

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- Details

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Debt (Narratives) (Details)	3 Months Ended			9 Months Ended
Debt (Narratives) (Details)	Sep. 30, 2016 USD ($) property	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) property loan	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Additional Debt Disclosures
Number of loans assumed \| loan				5
Non-recourse mortgage loans	$ 122,200,000			$ 122,200,000
Unamortized discount	$ 1,100,000			$ 1,100,000
Debt, weighted average interest rate	1.10%			1.10%
Debt instrument terms (years)				6 years
Payments of mortgage principal				$ 155,183,000	$ 114,867,000
Number of real estate properties \| property	388			388
Loss on the extinguishment of debt	$ 15,990,000		$ 5,000	$ 23,580,000	275,000
Line of credit, maximum borrowing capacity	$ 200,000,000	$ 250,000,000		$ 200,000,000
Commitment fee threshold	50.00%			50.00%
Credit facility fees				$ 1,900,000
Line of credit outstanding	$ 49,719,000			49,719,000		$ 112,834,000
Restriction payment threshold	100,000,000.0			100,000,000.0
Balloon payment	180,600,000			180,600,000
Effects of foreign currency translation on balance sheet item	3,707,000		$ (1,100,000)	15,442,000	$ (60,990,000)
Debt Refinanced
Additional Debt Disclosures
Non-recourse mortgage loans	$ 16,700,000			$ 16,700,000
Debt instrument terms (years)				4 years 9 months 18 days
Payments of mortgage principal				$ 11,200,000
Interest rate on debt	1.90%			1.90%
Loans refinanced \| loan				1
Self storage
Additional Debt Disclosures
Number of real estate properties \| property	37			37
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Additional Debt Disclosures
Payments of mortgage principal	$ 41,800,000			$ 84,700,000
Number of real estate properties \| property	52			52
Number of properties sold \| property	22			34
Revolver
Additional Debt Disclosures
Line of credit, maximum borrowing capacity		$ 200,000,000
Debt maturity date		Aug. 26, 2018
Debt	$ 50,000,000			$ 50,000,000		112,834,000
Line of credit outstanding	50,000,000			$ 50,000,000
Revolver \| Accordion
Additional Debt Disclosures
Line of credit, maximum borrowing capacity		$ 250,000,000
Term Loan
Additional Debt Disclosures
Line of credit, maximum borrowing capacity		$ 50,000,000
Debt maturity date				Aug. 26, 2018
Debt	50,000,000			$ 50,000,000		$ 0
Term Loan \| LIBOR
Additional Debt Disclosures
Debt instrument, variable interest rate				1.55%
Mortgages
Additional Debt Disclosures
Non-recourse mortgage loans	65,900,000			$ 65,900,000
Unamortized discount	$ 100,000			$ 100,000
Debt instrument terms (years)				4 years 9 months 18 days
Loans repaid, count \| loan				7
Interest rate on debt	3.02%			3.02%
Mortgages \| Self storage
Additional Debt Disclosures
Debt, weighted average interest rate	4.90%			4.90%
Debt instrument terms (years)				5 years 8 months 12 days
Payments of mortgage principal				$ 121,900,000
Number of real estate properties \| property	18			18
Non-recourse debt
Additional Debt Disclosures
Effects of foreign currency translation on balance sheet item				$ 13,000,000
Investments made in prior years
Additional Debt Disclosures
Non-recourse mortgage loans	$ 110,200,000			110,200,000
Current
Additional Debt Disclosures
Non-recourse mortgage loans	12,000,000			12,000,000
Self storage
Additional Debt Disclosures
Non-recourse mortgage loans	69,800,000			69,800,000
Unamortized discount	$ 1,200,000			$ 1,200,000
Additional ownership interest acquired				15.00%
Debt, weighted average interest rate	4.50%			4.50%
Debt instrument terms (years)				1 year 1 month 6 days
Minimum
Additional Debt Disclosures
Debt maturity date				Oct. 31, 2016
Credit facility fee, rate				0.15%
Minimum \| Revolver \| Base Rate
Additional Debt Disclosures
Interest rate on debt	0.50%			0.50%
Minimum \| Revolver \| LIBOR \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt	1.50%			1.50%
Minimum \| Term Loan \| Base Rate
Additional Debt Disclosures
Interest rate on debt	0.45%			0.45%
Minimum \| Term Loan \| LIBOR \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt	1.45%			1.45%
Maximum
Additional Debt Disclosures
Debt maturity date				Oct. 31, 2031
Credit facility fee, rate				0.30%
Maximum \| Revolver \| Base Rate
Additional Debt Disclosures
Interest rate on debt	1.25%			1.25%
Maximum \| Revolver \| LIBOR \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt	2.25%			2.25%
Maximum \| Term Loan \| Base Rate
Additional Debt Disclosures
Interest rate on debt	1.20%			1.20%
Maximum \| Term Loan \| LIBOR \| Euro Currency Rate
Additional Debt Disclosures
Interest rate on debt	2.20%			2.20%
Fixed interest rate \| Minimum
Additional Debt Disclosures
Mortgage loan real estate, maximum interest rate				1.90%
Fixed interest rate \| Maximum
Additional Debt Disclosures
Mortgage loan real estate, maximum interest rate				10.90%
Variable interest rate \| Minimum
Additional Debt Disclosures
Mortgage loan real estate, maximum interest rate				1.30%
Variable interest rate \| Maximum
Additional Debt Disclosures
Mortgage loan real estate, maximum interest rate				6.00%