XML 61 R44.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Mandatorily redeemable Series C preferred shares (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Equity [Abstract] |
Schedule of Dividend and Redemption Payments |
Estimated dividend payments due in the next five years and dividend and redemption payments thereafter are:
2018 | $ | 1,068 |
2019 | 1,282 |
2020 | 1,344 |
2021 | 1,364 |
2022 | 1,390 |
Thereafter to 2031 | 15,761 |
Redemption amount | 5,340 |
| 27,549 |
Less amounts representing interest | (9,085 | )
| 18,464 |
Less current portion | (1,068 | )
| $ | 17,396 |

X
- Definition Schedule of Dividend and Redemption Payments [Table Text Block] + References No definition available. + Details
Name: | aqunf_ScheduleOfDividendAndRedemptionPaymentsTableTextBlock
Namespace Prefix: | aqunf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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