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Overview and Basis of Presentation - Revenue in Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue: |  |
Total revenue | $ 277,428 | $ 325,807
Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenue: |  |
Total revenue |  | 325,807
Exhibition and Event Services [Member] | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenue: |  |
Total revenue |  | 275,948
Exhibits and Environments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenue: |  |
Total revenue |  | 41,923
Pursuit Services [Member] | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenue: |  |
Total revenue |  | $ 7,936

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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