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Leases - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) lease	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Number of leases not yet commenced | lease	3
Leases not yet commenced, liability		$ 25,900
Operating lease charge	$ 22,667
Impairment of right-of-use asset	9,969	3,700
Operating lease cost	71,257	67,044	$ 65,093
Sublease rental income	$ 11,329	$ 8,965	$ 3,671

X

- Definition

Lessee, Operating Lease, Lease Not yet Commenced, Number of Contracts

+ References

No definition available.

+ Details

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X

- Definition

Lessee, Operating Lease, Lease Not yet Commenced, Liability

+ References

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X

- 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.

+ Details

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
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X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

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-Publisher FASB
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- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

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