XML 96 R79.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Long-Term Debt - Summary of Financial Covenant and Leverage Ratio (Detail) | Apr. 11, 2018
--- | ---
September 30, 2018 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.75
December 31, 2018 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.75
March 31, 2019 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.75
June 30, 2019 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.50
September 30, 2019 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.50
December 31, 2019 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.50
March 31, 2020 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.25
June 30, 2020 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.25
September 30, 2020 [Member] |
Credit Facility [Line Items] |
Total Leverage Ratio | 2.00

X
- Definition Credit Facility [Line Items] + References No definition available. + Details
Name: | wetf_CreditFacilityLineItems
Namespace Prefix: | wetf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Leverage Ratio + References No definition available. + Details
Name: | wetf_LeverageRatio
Namespace Prefix: | wetf_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wetf_FiscalQuarterEndingNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |