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Goodwill and Other Intangible Assets - Goodwill by Reporting Unit and Segment (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 130,999 | $ 137,820
Marketing & Events U.S. [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 62,686 | 62,686
Marketing & Events Group [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 85,276 | 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 | 13,766 | 13,894
Marketing & Events International [Member] | GES Canada [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 8,824 | 9,160
Travel & Recreation Group [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 45,723 | 52,080
Travel & Recreation Group [Member] | Brewster [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 42,539 | 44,435
Travel & Recreation Group [Member] | Alaska Denali Travel [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 3,184 | 3,184
Travel & Recreation Group [Member] | Glacier Park [Member] |  |
Goodwill [Line Items] |  |
Goodwill |  | $ 4,461

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration