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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Provision (recovery) for credit losses |  |  | $ (11,000) | $ 14,200 |
Contract liabilities | $ 247,315 |  | 247,315 |  | $ 228,388
Contract with customer liability, deferred revenue current | 225,300 |  | 225,300 |  | $ 203,000
Deferred revenue, revenue recognized | 15,600 |  | 181,700 |  |
Non-recourse financing agreement, discount charge | 13,091 | $ 13,553 | 39,379 | 45,365 |
Receivables, Non-Recourse Arrangement |  |  |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Non-recourse financing agreement, discount charge | $ 800 | $ 900 | $ 2,300 | $ 4,100 |
Minimum |  |  |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Retainage, percentage of contract billings |  |  | 5.00% |  |
Maximum |  |  |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Retainage, percentage of contract billings |  |  | 10.00% |  |

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