CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 45,741	$ 34,784	$ 80,128	$ 47,083
Other comprehensive income (loss):
Unrealized gains on investments, net of tax	[1]	48	42	143	62
Unrealized foreign currency translation adjustments, net of tax	[1]	9,115	(3,849)	18,820	723
Change in net actuarial gain, net of tax	[1]	103	93	385	334
Change in prior service cost, net of tax	[1]	(67)	(78)	(201)	(234)
Comprehensive income		54,940	30,992	99,275	47,968
Comprehensive income attributable to noncontrolling interest		(1,084)	(992)	(747)	(765)
Comprehensive income attributable to Viad		$ 53,856	$ 30,000	$ 98,528	$ 47,203

[1] The tax effect on other comprehensive income (loss) is not significant.