Business Combinations - Pro Forma Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ProQuest
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenues, net	$ 2,702,984	$ 2,116,947
Pro forma net loss attributable to the Company's shareholders	$ (175,418)	(545,512)
CPA Global
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenues, net		1,708,486	$ 1,498,485
Pro forma net loss attributable to the Company's shareholders		(374,440)	(403,653)
Decision Resources Group
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenues, net		1,284,419	1,174,295
Pro forma net loss attributable to the Company's shareholders		$ (335,749)	$ (304,846)

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.

No definition available.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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