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Long-Term Incentive Plans - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Feb. 13, 1997
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Apr. 24, 2002
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Apr. 28, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Available shares for future issuance |
542,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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| Options exercised total intrinsic value |
$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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$ 26,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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$ 250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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| Proceeds from exercise of stock options |
0us-gaap_ProceedsFromStockOptionsExercised
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203,000us-gaap_ProceedsFromStockOptionsExercised
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17,000us-gaap_ProceedsFromStockOptionsExercised
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| Excess tax benefit from share-based payment arrangements |
0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
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116,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
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259,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
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| Restricted stock granted |
6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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100,150us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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60,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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| Restricted stock weighted average grant date fair value |
$ 23.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 23.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 23.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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| Total unrecognized compensation costs |
2,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
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| Recognition of compensation cost weighted average period |
3 years 2 months 12 days
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| Total fair value of shares vested |
1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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| Compensation expense-stock compensation plans |
1,139,000us-gaap_ShareBasedCompensation
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672,000us-gaap_ShareBasedCompensation
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(259,000)us-gaap_ShareBasedCompensation
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| Total income tax benefit under share-base compensation |
49,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
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116,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
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297,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
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| Incentive Plans [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Compensation expense-stock compensation plans |
$ 1,100,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= gifi_IncentivePlansMember
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$ 700,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= gifi_IncentivePlansMember
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$ 1,200,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= gifi_IncentivePlansMember
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| Employee [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted stock granted annual installments beginning first anniversary of the date of grant |
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20.00%gifi_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageVestingIncrementInPeriod
/ us-gaap_TitleOfIndividualAxis
= gifi_EmployeeMember
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| Employee Stock Option [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options authorized for grant |
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1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Stock options granted, term |
10 years
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| Employee Stock Option [Member] | Long Term Incentive Plan 2002 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options authorized for grant |
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500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= gifi_LongTermIncentivePlanTwentyZeroTwoMember
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| Stock options granted, term |
10 years
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| Employee Stock Option [Member] | Long Term Incentive Plan 2011 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options authorized for grant |
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500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= gifi_LongTermIncentivePlanTwentyElevenMember
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| Stock options granted, term |
10 years
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| Employee Stock Option [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options available for grant per individual employee |
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400,000gifi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableForGrantToIndividual
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Employee Stock Option [Member] | Maximum [Member] | Long Term Incentive Plan 2002 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options available for grant per individual employee |
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200,000gifi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableForGrantToIndividual
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= gifi_LongTermIncentivePlanTwentyZeroTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Employee Stock Option [Member] | Maximum [Member] | Long Term Incentive Plan 2011 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options available for grant per individual employee |
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200,000gifi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableForGrantToIndividual
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= gifi_LongTermIncentivePlanTwentyElevenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Non Performance Based [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted stock vesting period minimum |
3 years
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| Restricted Stock [Member] | Non-employee directors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted stock vesting period |
6 months
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