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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 212,413 | $ 150,112
United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 195,939 | 139,233
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,553 | 6,511
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,921 | 4,368
Project revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 144,429 | 87,432
O&M revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 18,062 | 15,211
Energy assets |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 28,222 | 24,985
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 21,700 | 22,484
US Regions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 84,727 | 55,597
US Regions | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 84,727 | 55,597
US Regions | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
US Regions | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
US Regions | Project revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 71,493 | 45,704
US Regions | O&M revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,352 | 3,318
US Regions | Energy assets |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 8,554 | 6,021
US Regions | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 328 | 554
U.S. Federal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 68,745 | 43,057
U.S. Federal | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 68,745 | 43,057
U.S. Federal | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
U.S. Federal | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
U.S. Federal | Project revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 56,114 | 32,353
U.S. Federal | O&M revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 11,626 | 9,858
U.S. Federal | Energy assets |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 719 | 643
U.S. Federal | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 286 | 203
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 11,392 | 7,148
Canada | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 896 | 702
Canada | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,496 | 6,446
Canada | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Canada | Project revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 8,864 | 5,234
Canada | O&M revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 9 | 0
Canada | Energy assets |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 663 | 320
Canada | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,856 | 1,594
Non-Solar DG |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 22,724 | 21,230
Non-Solar DG | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 22,724 | 21,230
Non-Solar DG | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Non-Solar DG | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Non-Solar DG | Project revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,371 | 1,074
Non-Solar DG | O&M revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,015 | 2,035
Non-Solar DG | Energy assets |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,986 | 17,699
Non-Solar DG | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 352 | 422
All Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 24,825 | 23,080
All Other | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 18,847 | 18,647
All Other | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 57 | 65
All Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,921 | 4,368
All Other | Project revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,587 | 3,067
All Other | O&M revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 60 | 0
All Other | Energy assets |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 300 | 302
All Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 18,878 | $ 19,711

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