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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% |  |

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- Definition 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. + References 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 + Details
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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 No definition available. + Details
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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 + Details
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