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Combined Statements of Financial Condition (Parenthetical) $ in Thousands	Dec. 31, 2017 USD ($) $ / shares
Investment in Gold, at cost	$ 18,434
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.00
SPDR Long Dollar Gold Trust [Member]
Investment in Gold, at cost	$ 18,434
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.00
Investment in Gold [Member]
Investment in Gold, at cost	$ 18,434
Investment in Gold [Member] | SPDR Long Dollar Gold Trust [Member]
Investment in Gold, at cost	$ 18,434

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Cost of the investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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