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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Commitments and Contingencies - Additional Information (Details) £ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 GBP (£)	Apr. 01, 2018 USD ($)	Mar. 31, 2019 GBP (£)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 GBP (£)
Loss Contingencies [Line Items]
Amount drawn/utilized	$ 11,300,000
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity	150,000,000				$ 150,000,000
Amount drawn/utilized	0		$ 0
Other - Bank overdraft
Loss Contingencies [Line Items]
Amount drawn/utilized	7,600,000		3,500,000
Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Debt maximum borrowing capacity	3,900,000			£ 3.0	3,800,000
Amount drawn/utilized	1,400,000	£ 1.0
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity	9,100,000			£ 7.0	$ 8,900,000	£ 7.0
Amount drawn/utilized	$ 0		$ 0