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Summary of Significant Accounting Policies - Schedule of Revenue, Initial Application Period Cumulative Effect Transition (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			¥ 4,218,946
Loan facilitation service fees [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606	¥ 3,310,875	$ 475,577	2,919,234	¥ 2,843,287
Post-facilitation service fees [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606	1,200,373	172,423	922,797	668,819
Other Revenue [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606	¥ 344,840	$ 49,533	376,915	¥ 491,400
Amounts without adoption of ASC Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			3,707,869
Amounts without adoption of ASC Topic 606 [Member] | Loan facilitation service fees [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			2,141,565
Amounts without adoption of ASC Topic 606 [Member] | Post-facilitation service fees [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			773,116
Amounts without adoption of ASC Topic 606 [Member] | Other Revenue [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			793,188
Effect of change [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			511,077
Effect of change [Member] | Loan facilitation service fees [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			777,669
Effect of change [Member] | Post-facilitation service fees [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			149,681
Effect of change [Member] | Other Revenue [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Impact on adoption of ASC 606			¥ (416,273)

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

No definition available.

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