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Contract Costs - Additional Information (Detail) (USD $)
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3 Months Ended |
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Mar. 31, 2015
Project
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Mar. 31, 2014
Project
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Dec. 31, 2014
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| Long-term Contracts or Programs Disclosure [Line Items] |
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| Pass-through costs as a percentage of revenue |
44.70%gifi_PassThroughCostsAsPercentOfRevenue
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68.90%gifi_PassThroughCostsAsPercentOfRevenue
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| Costs and estimated earnings in excess of billings on uncompleted contracts, unbilled costs |
$ 26,194,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
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$ 26,989,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
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| Billings in excess of costs and estimated earnings, advances |
13,208,000us-gaap_BillingsInExcessOfCostCurrent
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18,766,000us-gaap_BillingsInExcessOfCostCurrent
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| Estimate to complete projects |
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5,000,000gifi_EstimatedCostsToCompleteProjects
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| Number of projects orders changed |
2gifi_NumberOfProjects
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7gifi_NumberOfProjects
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| Project One [Member] |
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| Long-term Contracts or Programs Disclosure [Line Items] |
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| Estimate to complete projects |
21,600,000gifi_EstimatedCostsToCompleteProjects
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= gifi_ProjectOneMember
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| Percentage of complete projects |
76.00%gifi_PercentageOfProjectCompletion
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= gifi_ProjectOneMember
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| Project Two [Member] |
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| Long-term Contracts or Programs Disclosure [Line Items] |
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| Estimate to complete projects |
200,000gifi_EstimatedCostsToCompleteProjects
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= gifi_ProjectTwoMember
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| Percentage of complete projects |
88.00%gifi_PercentageOfProjectCompletion
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= gifi_ProjectTwoMember
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| Unbilled Contract Costs [Member] |
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| Long-term Contracts or Programs Disclosure [Line Items] |
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| Costs and estimated earnings in excess of billings on uncompleted contracts, unbilled costs |
17,300,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= gifi_UnbilledContractCostsMember
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| Number of major customers |
3gifi_NumberOfMajorCustomers
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= gifi_UnbilledContractCostsMember
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| Contract Advances [Member] |
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| Long-term Contracts or Programs Disclosure [Line Items] |
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| Number of major customers |
3gifi_NumberOfMajorCustomers
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= gifi_ContractAdvancesMember
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| Billings in excess of costs and estimated earnings, advances |
$ 7,600,000us-gaap_BillingsInExcessOfCostCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= gifi_ContractAdvancesMember
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