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International Revenues - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of revenue related to fabricated structures for delivery outside U.S | 9.00% | 16.00% | 3.00%

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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: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration