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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation allowance resulting in income tax benefit | $ 3,441,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent |  | $ 13,725,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | $ 5,618,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net deferred tax assets | 6,040,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  | 9,490,000 us-gaap_DeferredTaxAssetsLiabilitiesNet
Unrecognized stock-based compensation | 133,585,000 wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation |  |  | 101,108,000 wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation
NOLs deemed worthless | 3,487,000 wetf_NetOperatingLossAmountDeemedWorthless |  |  |
Deferred tax asset related to NOLs | 0 us-gaap_DeferredTaxAssetsNet |  |  |
Income tax expense/(benefit) | 8,958,000 us-gaap_IncomeTaxExpenseBenefit |  | (13,725,000)us-gaap_IncomeTaxExpenseBenefit |
Gross deferred tax asset | 3,450,000 us-gaap_DeferredTaxAssetsGross |  |  |
Credit to additional paid-in capital for the amount of NOLs from stock-based compensation | 5,158,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  |
State income taxes | 350,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  |  |
Income tax rate | 38.38%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 38.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |  |
Foreign Subsidiaries [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Deferred tax asset offset by a valuation allowance | $ 1,105,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember |  | $ 816,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember |
Previously Reported [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Income tax rate |  | 45.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |

X
- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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