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Business Combinations - Narrative (Details) $ in Thousands, £ in Millions |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2020 USD ($) | Mar. 01, 2020 GBP (£) | Jan. 01, 2020 USD ($) | Jan. 01, 2020 GBP (£) | Mar. 31, 2020 USD ($) | Mar. 01, 2020 GBP (£) | Jan. 01, 2020 GBP (£) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of future consideration payments |  |  |  |  | $ 11,700 |  |  |
Goodwill |  |  |  |  | 789,807 |  |  | $ 774,534
HCL |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership interest acquired | 100.00% |  |  |  |  | 100.00% |  |
Acquisition price | $ 20,400 | £ 15.9 |  |  |  |  |  |
Payments to acquire business | 14,300 | £ 11.2 |  |  |  |  |  |
Maximum contingent purchase price payments | 6,100 |  |  |  |  | £ 4.7 |  |
Fair value of future consideration payments |  |  |  |  | 5,900 |  |  |
Revenue |  |  |  |  | 2,600 |  |  |
Net income |  |  |  |  | $ 300 |  |  |
Intangible assets | 27,600 |  |  |  |  |  |  |
Goodwill | 19,100 |  |  |  |  |  |  |
HGPE |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition-date fair value of previous equity interest | 34,500 |  |  |  |  |  |  |
Gain as a result of remeasuring prior equity interest | $ 7,500 |  |  |  |  |  |  |
MEPC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition price |  |  | $ 11,400 | £ 8.6 |  |  |  |
Payments to acquire business |  |  | 6,000 | £ 4.5 |  |  |  |
Maximum contingent purchase price payments |  |  | 5,400 |  |  |  | £ 4.1 |
Intangible assets |  |  | 7,800 |  |  |  |  |
Goodwill |  |  | $ 4,200 |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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