Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

v2.4.1.9
Commitments and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2011
Subcontractor
Employee
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 01, 2012
Operating Leases, Rent, Net [Abstract]          
Operating lease expense   $ 6,576,000us-gaap_LeaseAndRentalExpense $ 9,826,000us-gaap_LeaseAndRentalExpense $ 11,544,000us-gaap_LeaseAndRentalExpense  
Sublease income   119,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 531,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 671,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1  
Net expense   6,457,000us-gaap_OperatingLeasesRentExpenseNet 9,295,000us-gaap_OperatingLeasesRentExpenseNet 10,873,000us-gaap_OperatingLeasesRentExpenseNet  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Operating Leases, Lease Commitments Due in 2014   3,859,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
Operating Leases, Lease Commitments Due in 2015   2,367,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
Operating Leases, Lease Commitments Due in 2016   1,939,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears      
Operating Leases, Lease Commitments Due in 2017   871,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
Operating Leases, Lease Commitments Due in 2018   316,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears      
Operating Leases, Lease Commitments Due Thereafter   0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter      
Operating Leases, Lease Commitments Due Total   9,352,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Operating Leases, Future Minimum Payments Receivable [Abstract]          
Operating Leases, Sublease Income Due in 2014   246,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent      
Operating Leases, Sublease Income Due in 2015   0us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears      
Operating Leases, Sublease Income Due in 2016   0us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears      
Operating Leases, Sublease Income Due in 2017   0us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears      
Operating Leases, Sublease Income Due in 2018   0us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears      
Operating Leases, Sublease Income Due Thereafter   0us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter      
Operating Leases, Sublease Income Due Total   246,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable      
Operating Leases, Future Minimum Payments, Net Commitments [Abstract]          
Operating Leases, Net Commitments Due in 2014   3,613,000vsec_OperatingLeasesFutureMinimumPaymentsNetCommitments      
Operating Leases, Net Commitments Due in 2015   2,367,000vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueInYearTwo      
Operating Leases, Net Commitments Due in 2016   1,939,000vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueInYearThree      
Operating Leases, Net Commitments Due in 2017   871,000vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueInYearFour      
Operating Leases, Net Commitments Due in 2018   316,000vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueInYearFive      
Operating Leases, Net Commitments Due Thereafter   0vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueThereafter      
Operating Leases, Net Commitments Due Total   9,106,000vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueTotal      
Capital Leases, Lease Commitments [Abstract]          
Capital Leases, Lease Commitments Due in 2014   3,985,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent      
Capital Leases, Lease Commitments Due in 2015   4,104,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears      
Capital Leases, Lease Commitments Due in 2016   4,221,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears      
Capital Leases, Lease Commitments Due in 2017   4,336,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears      
Capital Leases, Lease Commitments Due in 2018   4,456,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears      
Capital Leases, Lease Commitments Due Thereafter   36,447,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter      
Capital Leases, Lease Commitments, Total   57,549,000us-gaap_CapitalLeasesFutureMinimumPaymentsDue      
Capitalization of Construction Costs         27,300,000vsec_CapitalizationOfConstructionCosts
Long term Construction Costs Liability         $ 27,300,000vsec_LongTermConstructionCostsLiability
Contingencies [Abstract]          
Number of subcontractors that operated the facility 1vsec_NumberOfSubcontractorsThatOperatedFacility        
Number of deaths of subcontractor employees 5vsec_NumberOfDeathsOfSubcontractorEmployees        
Building Facilities [Member]          
Lease Obligations [Line Items]          
Term of Lease   15 years      
Operating Leases [Member] | Minimum [Member]          
Lease Obligations [Line Items]          
Term of Lease   2 years      
Operating Leases [Member] | Maximum [Member]          
Lease Obligations [Line Items]          
Term of Lease   15 years