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International Revenues - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Geographic Areas Revenues From External Customers In Percentage [Abstract] |  |  |
Percentage of revenue related to fabricated structures for delivery outside U.S | 10.00%gifi_EntityWideDisclosureOnGeographicAreasPercentOfRevenueFromExternalCustomersAttributedToForeignCountries | 6.00%gifi_EntityWideDisclosureOnGeographicAreasPercentOfRevenueFromExternalCustomersAttributedToForeignCountries | 9.00%gifi_EntityWideDisclosureOnGeographicAreasPercentOfRevenueFromExternalCustomersAttributedToForeignCountries

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- Definition Entity Wide Disclosure On Geographic Areas Percent Of Revenue From External Customers Attributed To Foreign Countries + References No definition available. + Details
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Namespace Prefix: | gifi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | gifi_GeographicAreasRevenuesFromExternalCustomersInPercentageAbstract
Namespace Prefix: | gifi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration