CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 38,548	$ 45,741	$ 52,093	$ 80,128
Other comprehensive income (loss):
Unrealized gains on investments, net of tax	[1]		48		143
Unrealized foreign currency translation adjustments, net of tax	[1]	3,340	9,115	(7,864)	18,820
Change in net actuarial gain, net of tax	[1]	(1,570)	103	(721)	385
Change in prior service cost, net of tax	[1]	186	(67)	6	(201)
Adoption of ASU 2016-01				(616)
Comprehensive income		40,504	54,940	42,898	99,275
Comprehensive income attributable to non-redeemable noncontrolling interest		(1,287)	(1,084)	(890)	(747)
Comprehensive loss attributable to redeemable noncontrolling interest		128		289
Comprehensive income attributable to Viad		$ 39,345	$ 53,856	$ 42,297	$ 98,528

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