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Risk Assurance Liabilities - Summary of Movement of Risk Assurance Liabilities (Detail)	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Guarantees [Abstract]
Balance at the beginning of the year	¥ 460,829,299	$ 72,314,173	¥ 259,952,473
Fair value of risk assurance liabilities upon the inception of new loans	443,831,604	69,646,863	348,921,174
Performed risk assurance liabilities	(403,388,438)	(63,300,448)	(150,312,528)
Net loss on risk assurance liabilities	197,750,449	31,031,361	2,268,180	¥ 34,257,754
Balance at the end of the year	¥ 699,022,914	$ 109,691,949	¥ 460,829,299	¥ 259,952,473

X

- Definition

Day 1 fair value of risk assurance liabilities.

+ References

No definition available.

+ Details

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X

- Definition

Amount of losses (gains) recorded along with the losses arising from risk assurance obligation and the gains from releasing of risk assurance obligation.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount of charge-offs, recoveries and buyback of risk assurance liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	cang_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

+ Details

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- References

No definition available.

+ Details

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