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Property, Plant and Equipment - Additional Information (Details) ft² in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Abstract] |  |  |
Lease agreement expenses | $ | $ 2.5 | $ 5.9 | $ 5.6
Office space area of leased premises | ft² | 8 |  |

X
- Definition Office Space Area + References No definition available. + Details
Name: | gifi_OfficeSpaceArea
Namespace Prefix: | gifi_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration