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Significant Accounting Policies - Gold Delivery Agreement Receivable (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Gold Delivery Agreement Receivable
Gold Delivery Agreement receivable	$ 0
SPDR Long Dollar Gold Trust [Member]
Gold Delivery Agreement Receivable
Gold Delivery Agreement receivable	$ 0

X

- Definition

Gold delivery agreement receivable.

+ References

No definition available.

+ Details

Name:	gldw_GoldDeliveryAgreementReceivable
Namespace Prefix:	gldw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Gold delivery agreement receivable.

+ References

No definition available.

+ Details

Name:	gldw_GoldDeliveryAgreementReceivableAbstract
Namespace Prefix:	gldw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=gldw_SPDRLongDollarGoldTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: