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1. NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
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Dec. 31, 2014
Buildings [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 8 years
Buildings [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 20 years
Plant and machinery [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 5 years
Plant and machinery [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 8 years
Motor vehicles [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 5 years
Furniture, fixtures and equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 8 years

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gure_PlantAndMachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |