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Acquisitions (Details 1) (Effective Companies [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Effective Companies [Member]
  
Business Acquisition [Line Items]  
Beginning Liability $ 5,083gpx_ContingentConsiderationLiabilities
/ us-gaap_BusinessAcquisitionAxis
= gpx_EffectiveCompaniesMember
Additions (Payments) 0gpx_ContingentConsiderationLiabilityAdditionsPayments
/ us-gaap_BusinessAcquisitionAxis
= gpx_EffectiveCompaniesMember
Change in Fair Value of Contingent Consideration 203gpx_IncreaseDecreaseInFairValueOfContingentConsideration
/ us-gaap_BusinessAcquisitionAxis
= gpx_EffectiveCompaniesMember
Foreign Currency Translation (559)gpx_ContingentConsiderationForeignCurrentTranslation
/ us-gaap_BusinessAcquisitionAxis
= gpx_EffectiveCompaniesMember
Ending Liability $ 4,727gpx_ContingentConsiderationLiabilities
/ us-gaap_BusinessAcquisitionAxis
= gpx_EffectiveCompaniesMember