Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Line Items]
Balance at December 31, 2015	$ 185,223
Business acquisitions	1,352
Foreign currency translation adjustments	900
Balance at June 30, 2016	187,475
Marketing & Events U.S. Segment
Goodwill [Line Items]
Balance at December 31, 2015	112,300
Balance at June 30, 2016	112,300
Marketing & Events International Segment
Goodwill [Line Items]
Balance at December 31, 2015	38,635
Foreign currency translation adjustments	(1,829)
Balance at June 30, 2016	36,806
Travel & Recreation Group
Goodwill [Line Items]
Balance at December 31, 2015	34,288
Business acquisitions	1,352
Foreign currency translation adjustments	2,729
Balance at June 30, 2016	$ 38,369