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Investment Funds and Other Variable Interest Entities - Schedule of Variable Interest Entity Financial Information (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets | [1] | $ 438,092 | $ 425,192
Total assets | [1] | 1,413,583 | 1,374,013
Variable interest entities, current liabilities | [1] | 316,079 | 336,647
Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 8,272 | 7,017
Total assets |  | 163,019 | 158,912
Variable interest entities, current liabilities |  | 6,633 | 6,563
Total VIE liabilities |  | 38,024 | 38,568
Cash and cash equivalents | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 5,789 | 4,666
Restricted cash | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 586 | 586
Accounts receivable, net | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 462 | 532
Costs and estimated earnings in excess of billings | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 1,355 | 1,125
Prepaid expenses and other current assets | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 80 | 108
Property and equipment, net | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent assets |  | 1,266 | 1,266
Energy assets, net | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent assets |  | 145,410 | 142,456
Operating lease assets | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent assets |  | 6,411 | 6,511
Other assets | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent assets |  | 1,660 | 1,662
Current portions of long-term debt and financing lease liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 2,234 | 2,252
Accounts payable | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 2,670 | 2,006
Accrued expenses and other current liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 1,623 | 2,203
Current portions of operating lease liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 106 | 102
Long-term debt and financing lease liabilities, less current portions and net of deferred financing fees | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent liabilities |  | 24,214 | 24,654
Long-term portions of operating lease liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent liabilities |  | 6,173 | 6,180
Other liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent liabilities |  | $ 1,004 | $ 1,171
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2020 and December 31, 2019 of $163,019 and $158,912, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2020 and December 31, 2019 of $38,024 and $38,568, respectively. See Note 12.

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