Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Depreciation	$ 12,723	$ 10,538	$ 24,055	$ 20,870
Amortization	2,074	2,266	4,062	4,409
Capital expenditures	17,141	20,809	37,862	32,193
Pursuit
Segment Reporting Information [Line Items]
Depreciation	9,942	8,279	18,565	16,413
Amortization	1,211	1,294	2,324	2,455
Capital expenditures	14,443	17,588	30,830	25,315
Spiro
Segment Reporting Information [Line Items]
Depreciation	508	600	1,069	1,100
Amortization	76	62	154	125
Capital expenditures	560	618	940	1,265
GES-Exhibitions
Segment Reporting Information [Line Items]
Depreciation	2,244	1,640	4,365	3,318
Amortization	787	910	1,584	1,829
Capital expenditures	2,132	2,590	6,083	5,598
Corporate
Segment Reporting Information [Line Items]
Depreciation	29	19	56	39
Capital expenditures	$ 6	$ 13	$ 9	$ 15

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480060/805-50-25-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480027/805-50-30-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480027/805-50-30-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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- 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.

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