Business Combination - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
Apr. 10, 2015	Jun. 30, 2015
Business Acquisition [Line Items]
Intangibles acquired in business combination		$ 2,400
ETFis Holdings LLC [Member]
Business Acquisition [Line Items]
Investment to acquire majority interest	$ 4,800
Goodwill acquired in business combination	1,400
Intangibles acquired in business combination	$ 2,400

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

+ References

No definition available.

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