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Summary of Significant Accounting Policies - Aggregate Fair Values of Outstanding and Unearned Contingent Consideration Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |
Contingent consideration liabilities, current portion | $ 3,466 | $ 77,618
Level 3 | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities | 10,969 | 84,160
Accounts payable and accrued expenses | Level 3 | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, current portion | 3,466 | 77,618
Insurance and other non-current liabilities | Level 3 | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, noncurrent | $ 7,503 | $ 6,542

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