Related Parties - Additional Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Jun. 30, 2021 |
Mar. 31, 2021 |
|
| Related Party Transaction [Line Items] | |||||||||
| Notes issued, related parties | $ 12,000 | $ 12,000 | $ 12,000 | $ 13,000 | |||||
| Property and equipment purchases | 119,600 | $ 65,000 | 96,700 | 46,400 | $ 12,100 | ||||
| Operating lease right of use assets | 45,753 | 45,753 | 30,076 | 22,045 | $ 40,022 | $ 32,881 | |||
| Expenses recognized for related party leases | $ 900 | $ 900 | 2,400 | $ 2,600 | |||||
| Property, Plant and Equipment [Member] | |||||||||
| Related Party Transaction [Line Items] | |||||||||
| Operating lease right of use assets | 15,400 | 18,900 | |||||||
| Lease Liabilities [Member] | |||||||||
| Related Party Transaction [Line Items] | |||||||||
| Operating lease right of use assets | 1,800 | 1,800 | |||||||
| Accounts Payable | |||||||||
| Related Party Transaction [Line Items] | |||||||||
| Property and equipment purchases | $ 14,700 | $ 10,400 | $ 6,500 | ||||||