Goodwill and Other Intangible Assets - Goodwill by Reporting Unit and Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 29, 2016	Dec. 31, 2015
Goodwill by reporting unit and segment
Goodwill	$ 270,551	$ 254,022		$ 185,223
GES U.S.
Goodwill by reporting unit and segment
Goodwill	148,277	148,277		112,300
GES International
Goodwill by reporting unit and segment
Goodwill	38,840	34,460		38,635
GES International | GES EMEA
Goodwill by reporting unit and segment
Goodwill	31,612	27,694
GES International | GES Canada
Goodwill by reporting unit and segment
Goodwill	7,228	6,766
GES
Goodwill by reporting unit and segment
Goodwill	187,117	182,737
Pursuit
Goodwill by reporting unit and segment
Goodwill	83,434	71,285		$ 34,288
Pursuit | Banff Jasper Collection
Goodwill by reporting unit and segment
Goodwill	35,305	32,587
Pursuit | Alaska Collection
Goodwill by reporting unit and segment
Goodwill	3,184	3,184
Pursuit | Glacier Park Collection
Goodwill by reporting unit and segment
Goodwill	1,268	1,268
FlyOver Canada
Goodwill by reporting unit and segment
Goodwill			$ 34,089
FlyOver Canada | Pursuit
Goodwill by reporting unit and segment
Goodwill	$ 43,677	$ 34,246