Consolidated Statements of Equity (UNAUDITED) (Parentheticals) - $ / shares	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Distribution per share
Distributions declared per share (usd per share)	$ 0.1625	$ 0.1625	$ 0.325	$ 0.3250

Distribution of earnings in the form of cash, property or capital stock declared by the board of directors to be distributed to shareholders.

No definition available.

Name:	cpa17_DistributionsDeclaredPerShare
Namespace Prefix:	cpa17_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration