Annual report pursuant to Section 13 and 15(d)

Nature of Business and Significant Accounting Policies (Details)

v2.4.1.9
Nature of Business and Significant Accounting Policies (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]                      
Basic weighted average common shares outstanding (in shares)                 5,353,912us-gaap_WeightedAverageNumberOfSharesIssuedBasic 5,329,208us-gaap_WeightedAverageNumberOfSharesIssuedBasic 5,282,047us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Effect of dilutive options (in shares)                 17,288us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 14,059us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 27,815us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average shares outstanding (in shares) 5,380,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,372,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,368,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,364,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,364,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,339,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,340,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,329,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,371,200us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,343,267us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,309,862us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Concentration of Credit Risk [Abstract]                      
Percentage of contracts with the government (in hundredths)                 99.00%vsec_PercentageOfContractsWithGovernment 99.00%vsec_PercentageOfContractsWithGovernment 99.00%vsec_PercentageOfContractsWithGovernment
Deferred Compensation Plans [Abstract]                      
Deferred compensation plan expense                 $ 1,300,000us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense $ 1,400,000us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense $ 1,200,000us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
Finite-Lived Intangible Assets [Line Items]                      
Weighted average useful life of intangible assets                 11 years 4 months 24 days    
Akimeka, LLC [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Impairment of intangible assets                   1,000,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= vsec_AkimekaLlcMember 		 
ICRC [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Impairment of intangible assets                   1,900,000us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= vsec_IcrcMember 		 
Goodwill impairment                 $ 790,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= vsec_IcrcMember 		$ 6,000,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= vsec_IcrcMember 		 
Contract-related [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Weighted average useful life of intangible assets                 11 years 9 months 18 days    
Trade Name [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Useful Life of intangible assets                 8 years 4 months 24 days    
Acquired Technologies [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Useful Life of intangible assets                 11 years    
Minimum [Member] | Contract-related [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Useful Life of intangible assets                 8 years    
Maximum [Member] | Contract-related [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Useful Life of intangible assets                 12 years    
Equipment [Member] | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 3 years    
Equipment [Member] | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 15 years    
Buildings and Land Improvements [Member] | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 15 years    
Buildings and Land Improvements [Member] | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 20 years