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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Contract with Customer, Asset and Liability (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Contract with customer, asset, revenue recognized in excess of amounts billed, current | $ 6.0 |  | $ 4.6
Contract with customer, liability, revenue recognized | 4.9 | $ 6.6 |
Shipyard Division |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Contract with customer, liability, accrued contract losses, current | $ 0.4 |  |

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- Definition Contract with customer, asset, revenue recognized in excess of amounts billed, current. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with customer liability accrued contract losses current. + References No definition available. + Details
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Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |