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Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Balance, beginning | $ 254,022 | $ 185,223
Business acquisitions | 8,154 | 71,658
Foreign currency translation adjustments | 8,375 | (2,859)
Balance, ending | 270,551 | 254,022
GES U.S. |  |
Goodwill [Line Items] |  |
Balance, beginning | 148,277 | 112,300
Business acquisitions |  | 35,977
Balance, ending | 148,277 | 148,277
GES International |  |
Goodwill [Line Items] |  |
Balance, beginning | 34,460 | 38,635
Business acquisitions | 1,060 |
Foreign currency translation adjustments | 3,320 | (4,175)
Balance, ending | 38,840 | 34,460
Pursuit |  |
Goodwill [Line Items] |  |
Balance, beginning | 71,285 | 34,288
Business acquisitions | 7,094 | 35,681
Foreign currency translation adjustments | 5,055 | 1,316
Balance, ending | $ 83,434 | $ 71,285

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- Definition Amount after accumulated impairment loss of 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) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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