Goodwill and Other Intangible Assets - Summary of the Goodwill by Segment and the Changes in the Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 78,954	$ 71,543
Reassignment
Translation adjustments	1,047	7,411
Goodwill, Ending Balance	80,001	78,954
BT [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	43,491	22,172
Reassignment		17,237
Translation adjustments	577	4,082
Goodwill, Ending Balance	44,068	43,491
TI [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		28,308
Reassignment		(28,308)
Translation adjustments
Goodwill, Ending Balance
M&S [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	33,362	19,160
Reassignment		11,071
Translation adjustments	442	3,131
Goodwill, Ending Balance	33,804	33,362
Events [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	2,101	1,903
Reassignment
Translation adjustments	28	198
Goodwill, Ending Balance	$ 2,129	$ 2,101