Organization (Narratives) (Details) - Jun. 30, 2015 ft² in Millions	ft² property tenant
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of tenants \| tenant	113
Square footage of real estate properties \| ft²	39
Real Estate Properties
Number of real estate properties	374
Capital interest in operating partnership	99.99%
Operating real estate
Real Estate Properties
Number of real estate properties	72
Square footage of operating properties \| ft²	5
Self storage
Real Estate Properties
Number of real estate properties	71
Hotel
Real Estate Properties
Number of real estate properties	1

The percentage of capital interest in the Operating Partnership by the general partner.

No definition available.

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Namespace Prefix:	cpa17_
Data Type:	num:percentItemType
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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	cpa17_NumberOfTenants
Namespace Prefix:	cpa17_
Data Type:	xbrli:integerItemType
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Period Type:	instant

- Definition

The total square footage of the operating properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	cpa17_SquareFootageOfOperatingProperties
Namespace Prefix:	cpa17_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RealEstatePropertiesAxis=cpa17_OperatingRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=cpa17_SelfStorageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=us-gaap_HotelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: