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Acquisition and Goodwill - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 15, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Time period over percentage change of ownership occur | 4 years |  |
Business acquisition consideration transferred | $ 0 |  |
Payout description |  | The ultimate payout will be made in cash over two years. |
Payout period | 4 years |  |
Acquisition transaction cost |  | 1,607 |
Goodwill |  | 1,676 |
Second Quarter [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition transaction cost |  | 753 |
WisdomTree Europe [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition ownership percentage | 75.00% |  |
Boost Shareholders [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition ownership percentage | 25.00% | 88.00% |
Redeemable noncontrolling interest, ownership percentage by noncontrolling owners |  | 25.00% |
Goodwill |  | 1,676 |
Purchase price |  | 1,757 |
Boost Shareholders [Member] | Fair Value[Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair Value of net assets acquired |  | 81 |
Boost Shareholders [Member] | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition transaction cost |  | $ 1,757 |

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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