Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Line Items]
Balance at December 31, 2015	$ 185,223
Business acquisitions	1,352
Foreign currency translation adjustments	2,691
Balance at March 31, 2016	189,266
Marketing & Events U.S. Segment
Goodwill [Line Items]
Balance at December 31, 2015	112,300
Balance at March 31, 2016	112,300
Marketing & Events International Segment
Goodwill [Line Items]
Balance at December 31, 2015	38,635
Foreign currency translation adjustments	211
Balance at March 31, 2016	38,846
Travel & Recreation Group
Goodwill [Line Items]
Balance at December 31, 2015	34,288
Business acquisitions	1,352
Foreign currency translation adjustments	2,480
Balance at March 31, 2016	$ 38,120