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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenue $ 115,253us-gaap_SalesRevenueNet $ 117,880us-gaap_SalesRevenueNet
Cost of revenue 96,118us-gaap_CostOfRevenue 99,525us-gaap_CostOfRevenue
Gross profit 19,135us-gaap_GrossProfit 18,355us-gaap_GrossProfit
Selling, general and administrative expenses 11,599us-gaap_SellingGeneralAndAdministrativeExpense 11,589us-gaap_SellingGeneralAndAdministrativeExpense
Gain (loss) on change in fair value of contingent consideration, net (203)gpx_GainLossOnChangeInFairValueOfContingentConsiderationNet 377gpx_GainLossOnChangeInFairValueOfContingentConsiderationNet
Operating income 7,333us-gaap_OperatingIncomeLoss 7,143us-gaap_OperatingIncomeLoss
Interest expense 365us-gaap_InterestExpense 205us-gaap_InterestExpense
Other income (expense) (225)us-gaap_OtherNonoperatingIncome 189us-gaap_OtherNonoperatingIncome
Income before income tax expense 6,743us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 7,127us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 2,636us-gaap_IncomeTaxExpenseBenefit 2,810us-gaap_IncomeTaxExpenseBenefit
Net income $ 4,107us-gaap_NetIncomeLoss $ 4,317us-gaap_NetIncomeLoss
Basic weighted average shares outstanding (in shares) 17,159us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 19,141us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares outstanding (in shares) 17,313us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 19,422us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per common share data:    
Basic earnings per share (in dollars per share) $ 0.24us-gaap_EarningsPerShareBasic $ 0.23us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) $ 0.24us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted