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Investment Funds and Equity Method Investments - Schedule of Variable Interest Entity Financial Information (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets | [1] | $ 485,779 | $ 490,715
Total assets | [1] | 1,848,749 | 1,750,251
Variable interest entities, current liabilities | [1] | 351,582 | 383,097
Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 10,142 | 10,935
Total assets |  | 159,136 | 162,198
Variable interest entities, current liabilities |  | 2,961 | 3,758
Total VIE liabilities |  | 32,614 | 33,335
Cash and cash equivalents | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 5,691 | 5,828
Restricted cash | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 2,438 | 3,185
Accounts receivable, net | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 592 | 834
Costs and estimated earnings in excess of billings | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 1,331 | 968
Prepaid expenses and other current assets | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current assets |  | 90 | 120
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 |  | 140,881 | 143,133
Operating lease assets | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent assets |  | 6,394 | 6,439
Other assets | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent assets |  | 453 | 425
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 |  | 2,215 | 2,230
Accounts payable | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 150 | 311
Accrued expenses and other current liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 466 | 1,092
Current portions of operating lease liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, current liabilities |  | 130 | 125
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent liabilities |  | 22,391 | 22,822
Long-term operating lease liabilities, net of current portion | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent liabilities |  | 6,195 | 6,220
Other liabilities | Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entities, noncurrent liabilities |  | $ 1,067 | $ 535
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12.

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