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v3.21.1

Commitments and Contingencies - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2020 lawsuits | Feb. 28, 2014 people | Mar. 28, 2021 USD ($) facility | Mar. 28, 2021 GBP (£) facility | Dec. 31, 2020 USD ($) facility | Dec. 31, 2020 GBP (£) facility | Mar. 28, 2021 GBP (£) | Dec. 31, 2020 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 73,600,000 |  |  |  |  |
Number of bonding facilities for bank guarantees | facility |  |  | 2 | 2 |  |  |  |
Amount drawn/utilized |  |  | $ 19,500,000 |  |  |  |  |
Borrowing capacity |  |  | 4,000,000.0 |  |  |  |  |
Credit facility, amount drawn |  |  | 0 |  | $ 0 |  |  |
Individuals with minor injuries | people |  | 3 |  |  |  |  |  |
Number of lawsuits | lawsuits | 3 |  |  |  |  |  |  |
Committed Banking Facilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  | 150,000,000.0 |  | 150,000,000.0 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | 23,600,000 |  | 4,100,000 |  |  |
Borrowing capacity |  |  | 126,400,000 |  | 145,900,000 |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  | 1,400,000 |  | $ 1,300,000 |  | £ 1,000,000.0 | £ 1,000,000.0
United Kingdom, Pounds |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of bonding facilities for bank guarantees | facility |  |  |  |  | 1 | 1 |  |
United Kingdom, Pounds | Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  | 6,200,000 |  | $ 6,100,000 |  | £ 4,500,000 |
Amount drawn/utilized |  |  | $ 1,400,000 | £ 1,000,000.0 | 1,400,000 | £ 1,000,000.0 |  |
United States of America, Dollars |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of bonding facilities for bank guarantees | facility |  |  | 1 | 1 |  |  |  |
United States of America, Dollars | Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  | $ 1,500,000 |  | 1,500,000 |  |  |
Amount drawn/utilized |  |  | $ 800,000 |  | $ 800,000 |  |  |

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