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Shares Repurchased - Additional Information (Detail) (Three-Year Share Repurchase Program [Member], USD $) | 3 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014 | Oct. 29, 2014
Common stock purchase authorized amount |  |  | $ 100,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Repurchased common stock, shares | 773 us-gaap_StockRepurchasedDuringPeriodShares |  |
Repurchased common stock, shares | 14,070,000 us-gaap_StockRepurchasedDuringPeriodValue |  |
Repurchased shares, remaining for future purchases | 85,930,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Tax Withholding Obligations [Member] |  |  |
Repurchased common stock, shares | 259 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_PlanNameAxis = wetf_ThreeYearShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = wetf_TaxWithholdingObligationsMember | 312 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_PlanNameAxis = wetf_ThreeYearShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = wetf_TaxWithholdingObligationsMember |
Repurchased common stock, shares | 4,385,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_PlanNameAxis = wetf_ThreeYearShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = wetf_TaxWithholdingObligationsMember | 5,426,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_PlanNameAxis = wetf_ThreeYearShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = wetf_TaxWithholdingObligationsMember |
Employee Equity Grants [Member] |  |  |
Repurchased common stock, shares | 514 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_PlanNameAxis = wetf_ThreeYearShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = wetf_EmployeeEquityGrantsMember |  |
Repurchased common stock, shares | $ 9,685,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_PlanNameAxis = wetf_ThreeYearShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = wetf_EmployeeEquityGrantsMember |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant