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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

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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
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
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-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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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.

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Business Acquisitions - Schedule of Supplemental Pro-Forma Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Total pro-forma revenues	$ 399.7	$ 395.6	$ 337.8
Total pro-forma net income (loss)	1.4	(6.6)	128.5
Lodestone Events [Member]
Business Acquisition [Line Items]
Total pro-forma revenues			6.4
Total pro-forma net income (loss)			0.5
Advertising Week [Member]
Business Acquisition [Line Items]
Total pro-forma revenues			5.5
Total pro-forma net income (loss)			(0.7)
Bulletin Inc [Member]
Business Acquisition [Line Items]
Total pro-forma net income (loss)			(2.1)
Other 2024 Acquisitions [Member]
Business Acquisition [Line Items]
Total pro-forma revenues	0.9	4.9
Total pro-forma net income (loss)	(0.8)	0.8
Hotel Interactive [Member]
Business Acquisition [Line Items]
Total pro-forma revenues		7.9
Total pro-forma net income (loss)		0.8
Emerald Revenue [Member]
Business Acquisition [Line Items]
Total pro-forma revenues	398.8	382.8	325.9
Emerald Net Income (Loss) [Member]
Business Acquisition [Line Items]
Total pro-forma net income (loss)	$ 2.2	$ (8.2)	$ 130.8