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Fair Value Measurements - Recurring and Nonrecurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Money market funds    
Fair value information related to assets    
Assets $ 8,500us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 $ 100us-gaap_AssetsFairValueDisclosure
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= us-gaap_MoneyMarketFundsMember
Other mutual funds    
Fair value information related to assets    
Assets 2,500us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= vvi_OtherMutualFundMember		 2,000us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring    
Fair value information related to assets    
Assets 11,054us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure, Recurring (1,210)us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring | Money market funds    
Fair value information related to assets    
Assets 8,518us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring | Other mutual funds    
Fair value information related to assets    
Assets 2,536us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Fair value information related to assets    
Assets 11,054us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure, Recurring 0us-gaap_LiabilitiesFairValueDisclosureRecurring
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Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds    
Fair value information related to assets    
Assets 8,518us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other mutual funds    
Fair value information related to assets    
Assets 2,536us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= vvi_OtherMutualFundMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair value information related to assets    
Assets 0us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure, Recurring 0us-gaap_LiabilitiesFairValueDisclosureRecurring
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds    
Fair value information related to assets    
Assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
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Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other mutual funds    
Fair value information related to assets    
Assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
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Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3)    
Fair value information related to assets    
Assets 0us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure, Recurring (1,210)us-gaap_LiabilitiesFairValueDisclosureRecurring
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3) | Money market funds    
Fair value information related to assets    
Assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3) | Other mutual funds    
Fair value information related to assets    
Assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
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Earnout Contingent Consideration    
Fair value information related to assets    
Liabilities, Fair Value Disclosure, Recurring (1,210)us-gaap_LiabilitiesFairValueDisclosureRecurring
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Earnout Contingent Consideration | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Fair value information related to assets    
Liabilities, Fair Value Disclosure, Recurring 0us-gaap_LiabilitiesFairValueDisclosureRecurring
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Earnout Contingent Consideration | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair value information related to assets    
Liabilities, Fair Value Disclosure, Recurring 0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Earnout Contingent Consideration | Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3)    
Fair value information related to assets    
Liabilities, Fair Value Disclosure, Recurring $ (1,210)us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
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