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Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Payables and Accruals [Abstract] |  |  |
Accrued compensation | $ 88,292 | $ 331,288 |
Payroll taxes payable | 105,555 | 61,564 |
Financial guarantee liability | 23,232 | 29,581 | $ 15
Deferred rent | 19,474 | 0 |
Contingent consideration | 10,132 | 14,519 |
Total | $ 246,685 | $ 436,952 |

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