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Taxation - Movement of Valuation Allowances (Detail) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
At beginning of year | ¥ 40,143 | ¥ 21,538 | ¥ 2,906
Current year additions | 741 | 22,585 | 18,688
Current year reversals | (34,639) | (3,980) | (56)
At end of year | ¥ 6,245 | ¥ 40,143 | ¥ 21,538

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- Definition Additions of the valuation allowance for deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | finv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reversals of valuation allowance for deferred tax asset. + References No definition available. + Details
Name: | finv_ValuationAllowanceDeferredTaxAssetCurrentYearReversalsAmount
Namespace Prefix: | finv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration