v3.10.0.1

Project debt, Details of project debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Project debt [Abstract]
Non-current	$ 4,956,811	$ 5,228,917
Current	262,009	246,291
Total Project debt	$ 5,218,820	$ 5,475,208

X

- Definition

The amount of current project debt issued at the project level under project finance.

+ References

No definition available.

+ Details

Name:	aby_CurrentProjectDebt
Namespace Prefix:	aby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The current and non-current portions of project debt issued at the project level under project finance.

+ References

No definition available.

+ Details

Name:	aby_LongTermAndShortTermProjectDebt
Namespace Prefix:	aby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The non-current portion of non-current project debt issued at the project level under project finance.

+ References

No definition available.

+ Details

Name:	aby_NoncurrentPortionOfNoncurrentProjectDebt
Namespace Prefix:	aby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	aby_ProjectDebtAbstract
Namespace Prefix:	aby_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration