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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unfunded commitment	$ 6.5

Amount of commitment unfunded as of the balance sheet date.

No definition available.

Name:	cpa17_UnfundedCommitment
Namespace Prefix:	cpa17_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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