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Summary of Significant Accounting Policies - Schedule of Financial Guarantee Derivative Movement Activities (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Summary Of Significant Accounting Policies [Line Items]
Settlement upon maturity of investor reserve arrangements	¥ (56,287)	$ (8,085)	¥ 272,057	¥ (383,061)
Financial Guarantee [Member]
Summary Of Significant Accounting Policies [Line Items]
Opening balance	56,287		(215,770)	167,291
Initial recognition of and change in fair value of ongoing investor reserve arrangements	(24,843)		114,813	(213,958)
Settlement upon maturity of investor reserve arrangements	¥ (31,444)		157,244	(169,103)
Ending balance			¥ 56,287	¥ (215,770)

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Summary of significant accounting policies.

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 25
-Section 50
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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