The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the delivery of services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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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.

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- Definition

Percentage of estimated fair values.

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No definition available.

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Accumulated Impairment Loss on Goodwill	$ 229.7	$ 229.7
Intangible asset amortization expense	$ 12.4	$ 9.2	$ 7.2
Customer contracts and relationships
Segment Reporting Information [Line Items]
Weighted-average amortization period of intangible assets	8 years 6 months
Tradenames
Segment Reporting Information [Line Items]
Weighted-average amortization period of intangible assets	7 years
Operating contracts and licenses
Segment Reporting Information [Line Items]
Weighted-average amortization period of intangible assets	26 years 3 months 18 days
Other
Segment Reporting Information [Line Items]
Weighted-average amortization period of intangible assets	2 years 2 months 12 days
Non-compete agreements
Segment Reporting Information [Line Items]
Weighted-average amortization period of intangible assets	2 years 2 months 12 days
GES U.S.
Segment Reporting Information [Line Items]
Percentage of estimated fair values	134.00%
FlyOver Canada
Segment Reporting Information [Line Items]
Percentage of estimated fair values	29.00%
GES EMEA \| GES International
Segment Reporting Information [Line Items]
Percentage of estimated fair values	214.00%
GES Canada \| GES International
Segment Reporting Information [Line Items]
Percentage of estimated fair values	164.00%
Banff Jasper Collection \| Pursuit
Segment Reporting Information [Line Items]
Percentage of estimated fair values	147.00%
Alaska Collection \| Pursuit
Segment Reporting Information [Line Items]
Percentage of estimated fair values	99.00%
Glacier Park Collection \| Pursuit
Segment Reporting Information [Line Items]
Percentage of estimated fair values	16.00%