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v3.20.4

Pension and Postretirement Benefits - Multi-Employer Pension Plans (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2020 PensionFund
Compensation And Retirement Disclosure [Abstract] |
Percentage of excess employer contributions | 5.00%
Aggregate number of funds | 31

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

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

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