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Prepaid Expenses and Other Assets - Additional Information (Detail) - Shanghai Qiaopan Technology Company Limited [Member] ¥ in Thousands | Dec. 31, 2019 CNY (¥)
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Prepaid Expenses And Other Assets [Line Items] |
Amount of guarantee | ¥ 100,000
Maximum [Member] |
Prepaid Expenses And Other Assets [Line Items] |
Percent of reserve pool on lending amount | 10.00%
Minimum [Member] |
Prepaid Expenses And Other Assets [Line Items] |
Percent of reserve pool on lending amount | 5.00%

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- Definition Guarantee commitments. + References No definition available. + Details
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Namespace Prefix: | finv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percent of reserve pool on lending amount. + References No definition available. + Details
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Namespace Prefix: | finv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Prepaid Expenses And Other Assets [Line Items] + References No definition available. + Details
Name: | finv_PrepaidExpensesAndOtherAssetsLineItems
Namespace Prefix: | finv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=finv_ShanghaiQiaopanTechnologyCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |