Summary of Significant Accounting Policies - Schedule of Distributions Per General Share and Share (Detail) - USD ($)		12 Months Ended
Dec. 24, 2019	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Distributions per share	$ 0.25383
General Shares [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Distributions per share		$ 0.25383	$ 0.18853
Distributions paid	$ 10	$ 10	$ 8
Shares [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Distributions per share		$ 0.25383	$ 0.18853
Distributions paid	$ 22,743,168	$ 22,743,168	$ 24,584,312

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 66
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e2814-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e2740-109256

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60A
-URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780132-109256

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