Label	Element	Value
Retained earnings [member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption1	gss_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1	$ (18,980,000)

Cumulative Effect Of New Accounting Principle In Period Of Adoption1

No definition available.

Name:	gss_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1
Namespace Prefix:	gss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant