Quarterly report pursuant to Section 13 or 15(d)

Investment Funds and Equity Method Investments - Schedule of Variable Interest Entity Financial Information (Details)

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Investment Funds and Equity Method Investments - Schedule of Variable Interest Entity Financial Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Variable interest entities, current assets [1] $ 502,191 $ 490,715
Total assets [1] 1,968,178 1,754,115
Variable interest entities, current liabilities [1] 348,916 383,097
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current assets 7,921 10,935
Total assets 126,088 162,198
Variable interest entities, current liabilities 2,942 3,758
Total VIE liabilities 31,224 33,335
Cash and cash equivalents | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current assets 5,088 5,828
Restricted cash | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current assets 0 3,185
Accounts receivable, net | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current assets 862 834
Costs and estimated earnings in excess of billings | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current assets 1,952 968
Prepaid expenses and other current assets | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current assets 19 120
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 110,153 143,133
Operating lease assets | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, noncurrent assets 6,318 6,439
Restricted cash, net of current portion | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, noncurrent assets 400 331
Other assets | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, noncurrent assets 30 94
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 2,224 2,230
Accounts payable | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current liabilities 100 311
Accrued expenses and other current liabilities | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current liabilities 481 1,092
Current portions of operating lease liabilities | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, current liabilities 137 125
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 21,749 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 6,178 6,220
Other liabilities | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Variable interest entities, noncurrent liabilities $ 355 $ 535
[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at September 30, 2021 and December 31, 2020 of $126,088 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at September 30, 2021 and December 31, 2020 of $31,224 and $33,335, respectively. See Note 12.