XML 150 R107.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Pension and Postretirement Benefits - Multi-Employer Pension Plans (Parenthetical) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 PensionFund
Compensation And Retirement Disclosure [Abstract] |
Percentage of excess employer contributions | 5.00%
Aggregate number of funds | 35

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pension plan, aggregate number of funds. + References No definition available. + Details
Name: | vvi_PensionPlanAggregateNumberOfFunds
Namespace Prefix: | vvi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of excess employer contribution made with base of plans forms. + References No definition available. + Details
Name: | vvi_PercentageOfExcessEmployerContributionMadeWithBaseOfPlansForms
Namespace Prefix: | vvi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration