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Contract Receivable - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Long-term Contracts or Programs Disclosure [Line Items] |  |
Contract receivable | $ 60,535 | $ 72,474
Contracts In Progress |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Contract receivable | 71,723 | 60,977
Cheviot Project |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Contract receivable | 31,300 |
Cheviot Project | Contracts In Progress |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Contract receivable | $ 31,300 |

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

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- Definition Amount billed to customers under long-term contracts or programs to be collected in the next fiscal year following the latest fiscal year. Excludes amounts due that have been withheld because of retainage provisions in a contract. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant