Acquisitions Schedule of Supplemental Pro Forma Data (Details) - Lost Creek And Post Rock - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended |
|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2015 |
|
| Business Acquisition [Line Items] | ||
| Pro forma total revenue | $ 89,697 | $ 260,497 |
| Pro forma total expenses | 125,261 | 315,976 |
| Pro forma net loss | (35,564) | (55,479) |
| Less: pro forma net loss attributable to noncontrolling interest | (5,927) | (23,539) |
| Pro forma net loss attributable to Pattern Energy | $ (29,637) | $ (31,940) |