Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reportable segments reconciliations:
Total revenues	$ 317,035	$ 256,391	$ 581,431	$ 542,032
Segment operating income (loss)	(34,303)	(12,145)	(30,368)	(23,467)
Interest income	443	54	506	119
Interest expense	(1,103)	(309)	(2,254)	(607)
Restructuring charges	(1,069)	(1,365)	(1,285)	(1,576)
Impairment charges			0	(884)
Income from continuing operations before income taxes	32,574	9,641	27,335	20,519
Marketing & Events Group
Reportable segments reconciliations:
Total revenues	286,569	226,586	543,497	504,409
Segment operating income (loss)	(30,083)	(9,020)	(33,767)	(27,190)
Restructuring charges	(383)	(244)	(471)	(206)
Marketing & Events International
Reportable segments reconciliations:
Restructuring charges	(133)	(990)	(271)	(1,520)
Impairment charges	0	(884)	0	(884)
Travel & Recreation Group
Reportable segments reconciliations:
Total revenues	30,466	29,805	37,934	37,623
Segment operating income (loss)	(6,203)	(5,116)	(1,394)	(307)
Restructuring charges	(148)	(135)	(142)	71
Other Segments
Reportable segments reconciliations:
Segment operating income (loss)	(36,286)	(14,136)	(35,161)	(27,497)
Corporate
Reportable segments reconciliations:
Segment operating income (loss)	(1,983)	(1,991)	(4,793)	(4,030)
Restructuring charges	(405)	4	(401)	79
Intersegment Eliminations | Marketing & Events Group
Reportable segments reconciliations:
Total revenues	(7,903)	(5,632)	(9,154)	(7,922)
U.S. | Marketing & Events Group
Reportable segments reconciliations:
Total revenues	208,749	168,839	401,692	390,234
Segment operating income (loss)	(18,974)	(5,124)	(21,611)	(20,975)
International | Marketing & Events Group
Reportable segments reconciliations:
Total revenues	85,723	63,379	150,959	122,097
Segment operating income (loss)	$ (11,109)	$ (3,896)	$ (12,156)	$ (6,215)