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Assets Held for Sale - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items] |  |  |
Fair value of assets held for sale |  | $ 10.3 us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure |
Impairment charge |  | 3.2 us-gaap_AssetImpairmentCharges |
Percentage of fair value of assets held for sale under sales assistance agreement | 50.00%gifi_PercentageOfFairValueOfAssetsHeldForSaleUnderSalesAssistanceAgreement |  |
Loss on sale of aircraft |  |  | 0.3 gifi_LossOnSaleOfAircraft
Aircraft [Member] |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Assets held for sale |  |  | 1.0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_AircraftTypeAxis = gifi_AircraftMember
Scenario, Previously Reported [Member] |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Fair value of assets held for sale |  | $ 13.5 us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |

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- Definition Loss On Sale Of Aircraft + References No definition available. + Details
Name: | gifi_LossOnSaleOfAircraft
Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage Of Fair Value Of Assets Held For Sale Under Sales Assistance Agreement + References No definition available. + Details
Name: | gifi_PercentageOfFairValueOfAssetsHeldForSaleUnderSalesAssistanceAgreement
Namespace Prefix: | gifi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
Name: | us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
Name: | us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AircraftTypeAxis=gifi_AircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |