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v3.21.1

Related parties - Summary of Remuneration to Related Parties (Parenthetical) (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
MSR Policy [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Deferred In Bonus Percentage Related To Defined Benefit Plan | 40.00% |
Deferred Cash Bonus Conversion Into Restricted Shares | $ 78,398 | $ 77,955
Annual Performance Bonus | 195,995 | 194,888
N Holland [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Salary paid, executive directors and prescribed officers | 424,550 | 416,670
P Schmidt [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Salary paid, executive directors and prescribed officers | 129,600 | 127,190
B Mattison [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Salary paid, executive directors and prescribed officers | 92,100 | 90,370
S Reid [Member] | Non Executive Directors [member] |  |
Disclosure of transactions between related parties [line items] |  |
Services received from related party | 34,960 | 14,351
A Andani [Member] | Non Executive Directors [member] |  |
Disclosure of transactions between related parties [line items] |  |
Services received from related party | $ 69,682 | $ 70,021

X
- Definition Annual performance bonus . + References No definition available. + Details
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Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deferred cash bonus conversion into restricted shares. + References No definition available. + Details
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Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deferred in bonus percentage related to defined benefit plan. + References No definition available. + Details
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Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The Cash outflow for payments to executive directors and Prescribed officers. + References No definition available. + Details
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Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The amount of services received in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_c&doctype=Standard -URIDate 2020-01-01 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gfi_TitleOfIndividual1Axis=gfi_PschmidtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gfi_TitleOfIndividual1Axis=gfi_BmattisonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gfi_TitleOfIndividual1Axis=gfi_SreidMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_IndependentNonExecutiveDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gfi_TitleOfIndividual1Axis=gfi_AandaniMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |