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Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Trade accounts payable $ 11,995us-gaap_AccountsPayableTradeCurrent $ 11,815us-gaap_AccountsPayableTradeCurrent
Accrued salaries, vacation and benefits 18,857gpx_AccruedSalariesVacationAndBenefits 15,731gpx_AccruedSalariesVacationAndBenefits
Other accrued expenses 20,608us-gaap_OtherAccruedLiabilitiesCurrent 20,127us-gaap_OtherAccruedLiabilitiesCurrent
Accrued contingent consideration 2,737gpx_AccruedContingentConsideration 2,405gpx_AccruedContingentConsideration
Negative cash book balance 4,821gpx_NegativeCashBookBalance 5,261gpx_NegativeCashBookBalance
Accounts Payable and Accrued Liabilities, Current, Total $ 59,018us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 55,339us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent