Goodwill and Other Intangible Assets - Additional Information (Details) (USD $)	12 Months Ended			3 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Marketing & Events U.S.	Dec. 31, 2013 United Kingdom (Melville GES)	Dec. 31, 2013 GES Canada	Dec. 31, 2013 Brewster	Dec. 31, 2013 Alaska Denali Travel	Dec. 31, 2013 Travel & Recreation Group	Dec. 31, 2013 Marketing & Events U.S.	Dec. 31, 2013 Marketing & Events International	Dec. 31, 2013 Customer Contracts
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss	$ 4,461,000								$ 4,461,000	$ 0	$ 0
Asset Impairment Charges, Non-Controlling Interest Amount									892,000
Percentage of estimated fair values				139.00%	58.00%	59.00%	54.00%	15.00%
Cumulative goodwill impairment losses	229,700,000
Intangible asset amortization expense	$ 1,300,000	$ 693,000	$ 772,000
Finite-Lived Intangible Asset, Useful Life	1 year 9 months 18 days											5 years 2 months 12 days