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Number of Bonding Facilities for Bank Guarantees

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Commitments and Contingencies - Additional Information (Details) £ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2014 people	Dec. 31, 2019 USD ($) facility	Dec. 31, 2019 GBP (£) facility	Dec. 31, 2018 USD ($)	Dec. 31, 2018 GBP (£)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2018 GBP (£)	Jul. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Capital expenditure commitments		$ 1,000,000.0		$ 2,500,000		$ 600,000
Long-term debt, gross		$ 92,500,000
Number of bonding facilities \| facility		2	2
Individuals with minor injuries \| people	3
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		$ 150,000,000.0		150,000,000
Amount drawn/utilized		0		0
Other - Bank overdraft
Loss Contingencies [Line Items]
Long-term debt, gross		0		3,500,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		1,300,000		8,900,000			£ 1.0	£ 7.0
Amount drawn/utilized		0		0
Revolving credit facility
Loss Contingencies [Line Items]
Debt maximum borrowing capacity									$ 150,000,000
Long-term debt, gross		$ 17,500,000		0
GBP
Loss Contingencies [Line Items]
Number of bonding facilities \| facility		1	1
GBP \| Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		$ 5,900,000		3,800,000			£ 4.5	£ 3.0
Amount drawn/utilized		$ 2,300,000	£ 1.5	$ 1,900,000	£ 1.5
U.S. dollars
Loss Contingencies [Line Items]
Number of bonding facilities \| facility		1	1
U.S. dollars \| Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Amount drawn/utilized		$ 400,000