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Trust Expenses (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Sponsor's fee, annualized accrual rate based on adjusted daily net asset value	0.25%
Legal fees, per year, maximum	$ 100,000

X

- Definition

Maximum per annum in legal fees and expenses the sponsor has agreed to assume.

+ References

No definition available.

+ Details

Name:	iau_LegalFeesPerYearMaximum
Namespace Prefix:	iau_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Annualized sponsor's fee rate accrued daily based on the adjusted net asset value of the trust.

+ References

No definition available.

+ Details

Name:	iau_SponsorsFeeAnnualizedAccrualRateBasedOnAdjustedDailyNetAssetValueAfterAdjustmentDate
Namespace Prefix:	iau_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration