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Prepaid Expenses and Other Assets - Additional Information (Detail) - Shanghai Qiaopan Technology Company Limited [Member] ¥ in Thousands	Dec. 31, 2019 CNY (¥)
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%

X

- Definition

Guarantee commitments.

+ References

No definition available.

+ Details

Name:	finv_GuaranteeCommitments
Namespace Prefix:	finv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percent of reserve pool on lending amount.

+ References

No definition available.

+ Details

Name:	finv_PercentOfReservePoolOnLendingAmount
Namespace Prefix:	finv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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