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Summary of Significant Accounting Policies - Leases Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease rent expense |  |  | $ 365,762 | $ 350,403 |
Sublease Income |  | $ 6,637 |  |  |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, term |  | 5 years |  |  |
Lessee, operating lease, renewal term |  | 1 year |  |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, term |  | 10 years |  |  |
Lessee, operating lease, renewal term |  | 5 years |  |  |
Vehicle And Equipment | Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, term |  | 1 year |  |  |
Vehicle And Equipment | Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, term |  | 7 years |  |  |
ASU 2016-02 |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 5,781 |  | $ 5,800
United Kingdom |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, term |  | 25 years |  |  |
Forecast | United Kingdom |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Rent expense | $ 5,000 |  |  |  |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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