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Supplemental Disclosure of Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Interest Paid [Abstract]    
Interest $ (1)us-gaap_InterestPaid $ 0us-gaap_InterestPaid
Income Taxes Paid, Net [Abstract]    
Income taxes 395us-gaap_IncomeTaxesPaidNet 539us-gaap_IncomeTaxesPaidNet
Noncash or Part Noncash Acquisitions [Line Items]    
Noncash or Part Noncash Acquisition, Other Liabilities Assumed 4,160us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 0us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
Hyperspring, LLC [Member]    
Noncash or Part Noncash Acquisitions [Line Items]    
Noncash or Part Noncash Acquisition, Other Liabilities Assumed 3,953us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
/ us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis
= gvp_HyperspringLlcMember
0us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
/ us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis
= gvp_HyperspringLlcMember
IntelliQlik, LLC [Member]    
Noncash or Part Noncash Acquisitions [Line Items]    
Noncash or Part Noncash Acquisition, Other Liabilities Assumed $ 207us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
/ us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis
= gvp_IntelliqlikLlcMember
$ 0us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
/ us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis
= gvp_IntelliqlikLlcMember