Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning balance	$ 0us-gaap_Goodwill	$ 4,502us-gaap_Goodwill
Goodwill impairment loss	0us-gaap_GoodwillImpairmentLoss	4,462us-gaap_GoodwillImpairmentLoss
Acquisition	5,612us-gaap_GoodwillAcquiredDuringPeriod	0us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation	0us-gaap_GoodwillTranslationAdjustments	40us-gaap_GoodwillTranslationAdjustments
Goodwill, Period Increase (Decrease), Total	5,612us-gaap_GoodwillPeriodIncreaseDecrease	(4,502)us-gaap_GoodwillPeriodIncreaseDecrease
Ending balance	5,612us-gaap_Goodwill	0us-gaap_Goodwill
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,031	2,297
Accumulated amortization	1,752	1,588
Total	1,279us-gaap_FiniteLivedIntangibleAssetsNet	709us-gaap_FiniteLivedIntangibleAssetsNet
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014	494
2015	296
2016	207
2017	160
2018	74
Thereafter	48
Total	1,279
Amortization of definite-lived intangible assets	193us-gaap_AmortizationOfIntangibleAssets	207us-gaap_AmortizationOfIntangibleAssets
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,425	646
Accumulated amortization	695	646
Total	730	0
Non Contractual Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	911	911
Accumulated amortization	618	557
Total	293	354
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	471	471
Accumulated amortization	236	177
Total	235	294
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	152	152
Accumulated amortization	136	127
Total	16	25
Contract Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	36	36
Accumulated amortization	36	36
Total	0	0
Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	29	29
Accumulated amortization	29	29
Total	0	0
Foreign Currency Translation [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7	52
Accumulated amortization	2	16
Total	$ 5	$ 36

The aggregate estimated amortization expense for succeeding fiscal years for intangible assets subject to amortization.

No definition available.

Name:	gvp_FiniteLivedIntangibleAssetsFutureAmortizationExpense1
Namespace Prefix:	gvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References