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Taxation - Movement of Valuation Allowances (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	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

X

- 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration