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Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income of Viad's Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 39 $ 10 $ 48 $ 20
Interest cost 178 259 407 517
Expected return on plan assets (68) (37) (107) (130)
Recognized net actuarial loss 94 98 230 213
Net periodic benefit cost 243 330 578 620
US Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 17 33 47 69
Interest cost 93 152 219 303
Amortization of prior service credit (105) (126) (216) (252)
Recognized net actuarial loss 20 81 120 175
Net periodic benefit cost 25 140 170 295
Foreign Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 128 125 258 245
Interest cost 113 126 226 244
Expected return on plan assets (146) (144) (294) (279)
Recognized net actuarial loss 45 1 89 1
Net periodic benefit cost $ 140 $ 108 $ 279 $ 211