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Energy Assets - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) project developer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Energy assets, net | $ 459,952,000 | $ 356,443,000 |
Capital lease assets | 42,402,000 | 38,725,000 |
Less - accumulated depreciation and amortization | (4,139,000) | (2,049,000) |
Capital lease assets, net | 38,263,000 | 36,676,000 |
Project asset depreciation | 27,305,000 | 21,648,000 | $ 19,377,000
Depreciation and amortization expense on capital lease assets | $ 2,090,000 | 1,305,000 | $ 570,000
Number of developers current year solar projects were purchased from | developer | 2 |  |
Asset retirement obligation, project assets | $ 897,000 |  |
Asset retirement obligation | 897,000 | 0 |
Renewal Energy Program |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Energy assets | 619,708,000 | 488,818,000 |
Less - accumulated depreciation and amortization | (159,756,000) | (132,375,000) |
Energy assets, net | $ 459,952,000 | $ 356,443,000 |
Solar Projects 2018 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of projects acquired | project | 12 |  |
Fair value of consideration | $ 72,921,000 |  |
Contingent consideration liabilities | 5,437,000 |  |
Payments to acquire businesses | $ 62,116,000 |  |
Scenario, Plan |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of projects acquired | project | 6 |  |
Scenario, Plan | Solar Projects 2018 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of projects acquired | project | 6 |  |

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