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Long-Term Debt (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Right
Bond
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate During Period 4.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod      
Number of consecutive quarters entity must attain positive net income 2gvp_NumberOfConsecutiveQuartersEntityMustAttainPositiveNetIncome      
Issuances of stand-by letters of credit and advances as of period end $ 4,200,000us-gaap_LineOfCreditFacilityAmountOutstanding      
Performance Bond Abstract        
Number of Standby Letters of Credit 14gvp_NumberOfStandbyLettersOfCredit      
Number of Surety Bonds 1gvp_NumberOfSuretyBonds      
Letter of Credit and Surety Bonds 4,300,000gvp_LetterOfCreditAndSuretyBondsContingentConsideration      
Number of Performance and Bid Bonds issued in relation to contracts 12gvp_NumberOfBidBondsContract      
Number of stand by letters of credit deposited in escrow accounts 14gvp_Numberofstandbylettersofcreditdepositedinescrowaccounts      
Restricted cash and investments 4,200,000us-gaap_RestrictedCashAndCashEquivalents   4,200,000us-gaap_RestrictedCashAndCashEquivalents  
Susquehanna Bank [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Principal amount of the line of credit 7,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= gvp_SusquehannaBankMember
     
Line of Credit Facility, Affiliated Borrower GSE Systems, Inc. and GSE Performance Solutions, Inc.      
Line of Credit Facility, Interest Rate Description Working capital advances bear interest at a rate equal to the Wall Street Journal Prime Rate of Interest, floating with a floor of 4 1/2%      
Line of credit facility term 2 years      
Expiration date of credit agreement Jun. 30, 2015      
Minimum Cash Balance Requirement 3,000,000gvp_LineOfCreditFacilityAssetRestrictionsMinimumCash
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= gvp_SusquehannaBankMember
     
Susquehanna Bank [Member] | Revolving Credit Facility [Member] | Cash flow coverage ratio [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Covenant Terms Must Exceed 1.20 : 1.00      
Line of Credit Facility, Covenant Compliance   -4.41 : 1.00    
Susquehanna Bank [Member] | Revolving Credit Facility [Member] | Minimum tangible capital base [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Covenant Terms Must Exceed $26.0 million      
Line of Credit Facility, Covenant Compliance   $14.5 million    
Susquehanna Bank [Member] | Revolving Credit Facility [Member] | Quick Ratio [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Covenant Terms Must Exceed 2.00 : 1.00      
Line of Credit Facility, Covenant Compliance   1.63 : 1.00    
Susquehanna Bank [Member] | Revolving Credit Facility [Member] | Tangible capital base ratio [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Covenant Terms Not to Exceed .75 : 1.00      
Line of Credit Facility, Covenant Compliance   1.41 : 1.00    
IberiaBank [Member] | Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Principal amount of the line of credit 1,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= gvp_IberiaBankMember
     
Line of Credit Facility, Affiliated Borrower Hyperspring, LLC      
Line of Credit Facility, Interest Rate Description interest is payable monthly at a rate of the prime rate of interest as published in the money rate section of the Wall Street Journal plus 1.00 %      
Line of Credit Facility, Collateral The line is secured by all accounts of Hyperspring and guaranteed by GSE Systems, Inc.      
Line of credit facility term 0 years 5 months 9 days      
Expiration date of credit agreement Jun. 30, 2015      
Line of Credit Facility, Fair Value of Amount Outstanding $ 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= gvp_IberiaBankMember
    $ 339,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= gvp_IberiaBankMember