Goodwill and Other Intangible Assets - Goodwill by Reporting Unit and Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill by reporting unit and segment
Goodwill	$ 185,223	$ 194,197	$ 129,543
Marketing & Events U.S. Segment
Goodwill by reporting unit and segment
Goodwill	112,300	110,618	62,686
Marketing & Events U.S. Segment | United States
Goodwill by reporting unit and segment
Goodwill	112,300	110,618
Marketing & Events International Segment
Goodwill by reporting unit and segment
Goodwill	38,635	42,221	22,611
Marketing & Events International Segment | GES EMEA
Goodwill by reporting unit and segment
Goodwill	32,064	34,396
Marketing & Events International Segment | GES Canada
Goodwill by reporting unit and segment
Goodwill	6,571	7,825
Marketing and Events Group
Goodwill by reporting unit and segment
Goodwill	150,935	152,839
Travel & Recreation Group
Goodwill by reporting unit and segment
Goodwill	34,288	41,358	$ 44,246
Travel & Recreation Group | Brewster
Goodwill by reporting unit and segment
Goodwill	29,836	36,906
Travel & Recreation Group | Alaska Denali Travel
Goodwill by reporting unit and segment
Goodwill	3,184	3,184
Travel & Recreation Group | Glacier Park
Goodwill by reporting unit and segment
Goodwill	$ 1,268	$ 1,268