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Business Combinations and Acquisitions - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 01, 2016	Apr. 30, 2014	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Business acquisition, goodwill				$ 1,799,000	$ 1,676,000
Acquisition payment			$ 5,993,000	6,738,000	2,185,000
Amounts payable in acquisition				3,537,000	3,942,000
Boost [Member]
Business Acquisition [Line Items]
Business acquisition, goodwill				$ 1,676,000
Percentage of issued and outstanding membership interest acquired		75.00%
Business acquisition consideration transferred		$ 0
Non-controlling interest				25.00%
Compensation expense					997,000
Interest expense					$ 1,188,000
GreenHaven Commodity Services, LLC [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid	$ 11,825,000
Business acquisition, recognized an intangible asset related to customary advisory agreement with Commodities ETF	9,953,000
Business acquisition, goodwill	$ 1,799,000
Estimate of Fair Value Measurement [Member] | Boost [Member]
Business Acquisition [Line Items]
Fair value of net assets acquired				$ 81,000
Boost Shareholders [Member]
Business Acquisition [Line Items]
Guaranteed minimum payment				$ 1,757,000

X

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Business combination compensation expenses.

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Business combination minimum guaranteed payment on termination of employment.

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