v3.10.0.1

Project debt, movement in project debt, split between cash and non-cash items (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Project debt [Abstract] |
Beginning balance | $ 5,475,208
Cash flow | (579,598)
Non-cash changes | 195,504
Ending balance | $ 5,091,114

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 change in current and non-current portions of project debt issued at the project level under project finance during the period - cash movement. + References No definition available. + Details
Name: | aby_MovementInLongTermAndShortTermProjectDebtCashFlows
Namespace Prefix: | aby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The change due to current and non-current portions of project debt issued at the project level under project finance during the period - non-cash movement. + References No definition available. + Details
Name: | aby_MovementInLongTermAndShortTermProjectDebtNonCashCharges
Namespace Prefix: | aby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | aby_ProjectDebtAbstract
Namespace Prefix: | aby_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration