Income Taxes (Details)	6 Months Ended
Jun. 30, 2015
Income Taxes [Abstract]
Minimum probability of uncertain tax position to be recognized (in hundredths)	50.00%
Minimum percentage of tax position realized upon ultimate settlement (in hundredths)	50.00%

Describes the minimum probability of uncertain tax position taken or expected to be taken in a tax return is recognized in the financial statements.

No definition available.

Name:	gvp_MinimumProbabilityOfUncertainTaxPositionToBeRecognized
Namespace Prefix:	gvp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration