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Revenue and Related Contract Costs and Contract Liabilities - Disaggregate GES and Pursuit Revenue by Major Product Line Timing of Revenue Recognition and Markets Served (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation Of Revenue [Line Items]                      
Total revenue $ 296,916 $ 358,163 $ 363,677 $ 277,428 $ 277,285 $ 339,099 $ 364,774 $ 325,807 $ 1,296,184 $ 1,306,965 $ 1,204,970
GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 1,110,897    
GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 1,110,897 1,133,097 1,054,739
GES | Intersegment Eliminations                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 (17,489) (21,769) (20,172)
Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 185,287    
Pursuit | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 185,287 173,868 153,364
Pursuit | Intersegment Eliminations                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 (1,551)    
U.S.                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 894,442 913,210 855,304
U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 847,241 872,154 826,408
International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 281,145 282,712 248,503
Services Transferred Over Time | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 972,846    
Services Transferred Over Time | GES | Intersegment Eliminations                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 (17,489)    
Services Transferred Over Time | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 137,404    
Services Transferred Over Time | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 778,908    
Services Transferred Over Time | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 211,427    
Products Transferred Over Time | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue [1]                 60,193    
Products Transferred Over Time | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue [1]                 41,448    
Products Transferred Over Time | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue [1]                 18,745    
Products Transferred at a Point in Time | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 77,858    
Products Transferred at a Point in Time | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 47,883    
Products Transferred at a Point in Time | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 26,885    
Products Transferred at a Point in Time | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 50,973    
Core Services | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 854,126    
Core Services | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 675,368    
Core Services | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 178,758    
Audio Visual | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 95,342    
Audio Visual | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 73,331    
Audio Visual | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 22,011    
Event Technology | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 40,866    
Event Technology | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 30,208    
Event Technology | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 10,658    
Total Services | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 972,845    
Total Services | GES | Intersegment Eliminations                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 (17,489)    
Total Services | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 137,404    
Total Services | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 778,907    
Total Services | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 211,427    
Core Products | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 138,052    
Core Products | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 68,334    
Core Products | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 69,718    
Exhibitions | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 661,634    
Exhibitions | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 455,561    
Exhibitions | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 206,073    
Conferences | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 279,107    
Conferences | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 241,494    
Conferences | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 37,613    
Corporate Events | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 154,912    
Corporate Events | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 121,552    
Corporate Events | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 33,360    
Consumer Events | GES                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 32,733    
Consumer Events | U.S. | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 28,634    
Consumer Events | International | GES | Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 4,099    
Admissions | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 83,000    
Accommodations | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 37,470    
Transportation | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 13,956    
Travel Planning | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 4,529    
Food and Beverage | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 25,962    
Retail Operations | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 21,921    
Products                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 185,935 $ 174,541 $ 154,241
Products | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 47,883    
Banff Jasper Collection | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 106,106    
Alaska Collection | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 36,451    
Glacier Park Collection | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 31,465    
FlyOver | Pursuit                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 $ 11,265    
[1] GES’ graphics product revenue is recognized over time as it is considered a part of the single performance obligation satisfied over time.