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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based payments (Details) | 12 Months Ended
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Dec. 31, 2018 item
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Number of trading sessions | 20

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- Definition Number of most recent trading sessions that the weighted average cost of ESPP are based on. + References No definition available. + Details
Name: | kgc_NumberOfTradingSessions
Namespace Prefix: | kgc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This concept does not have any references. + References No definition available. + Details
Name: | kgc_SummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | kgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration