Significant accounting policies, Basis of preparation (Details)	Jun. 13, 2014 ConcessionalAsset
Significant accounting policies [Abstract]
Number of selected assets subject to ROFO Agreement	4

The number of assets in select countries subject to the entity's Right of First Offer (ROFO) Agreement.

No definition available.

Name:	aby_NumberOfAssetsSubjectToAgreement
Namespace Prefix:	aby_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration