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Goodwill and Other Intangible Assets - Goodwill by Reporting Unit and Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill $ 133,422 $ 137,820
Marketing & Events U.S. [Member]
    
Goodwill [Line Items]    
Goodwill 62,686 62,686
Marketing & Events Group [Member]
    
Goodwill [Line Items]    
Goodwill 84,239 85,740
Marketing & Events Group [Member] | Marketing & Events U.S. [Member]
    
Goodwill [Line Items]    
Goodwill 62,686 62,686
Marketing & Events International [Member] | GES United Kingdom [Member]
    
Goodwill [Line Items]    
Goodwill 12,907 13,894
Marketing & Events International [Member] | GES Canada [Member]
    
Goodwill [Line Items]    
Goodwill 8,646 9,160
Travel & Recreation Group [Member]
    
Goodwill [Line Items]    
Goodwill 49,183 52,080
Travel & Recreation Group [Member] | Brewster [Member]
    
Goodwill [Line Items]    
Goodwill 41,538 44,435
Travel & Recreation Group [Member] | Glacier Park [Member]
    
Goodwill [Line Items]    
Goodwill 4,461 4,461
Travel & Recreation Group [Member] | Alaska Denali Travel [Member]
    
Goodwill [Line Items]    
Goodwill $ 3,184 $ 3,184