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Commitments and Contingencies - Additional Information (Details)	1 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended
	Nov. 30, 2020 lawsuits	Feb. 28, 2014 people	Jun. 27, 2021 USD ($)	Jun. 27, 2021 USD ($) facility	Jun. 27, 2021 GBP (£) facility	Dec. 31, 2020 USD ($) facility	Dec. 31, 2020 GBP (£) facility	Jun. 27, 2021 GBP (£)	Mar. 28, 2021 USD ($)	Dec. 31, 2020 GBP (£)
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility				2	2
Amount drawn/utilized			$ 23,900,000
Borrowing capacity			4,000,000.0	$ 4,000,000.0
Credit facility, amount drawn			0	0		$ 0
Number of people with minor injuries | people		3
Number of lawsuits | lawsuits	3
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			100,000,000.0	100,000,000.0		150,000,000.0
Revolving credit facility
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			100,000,000.0	100,000,000.0					$ 150,000,000.0
Long-term debt, gross			0	0		4,100,000
Borrowing capacity			100,000,000.0	100,000,000.0		145,900,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			1,400,000	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			6,300,000	6,300,000		$ 6,100,000		£ 4,500,000
Amount drawn/utilized				$ 800,000	£ 600,000	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		1,500,000
Amount drawn/utilized				$ 800,000		$ 800,000

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