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Finance Lease Receivables, Net - Summary of Movement of Allowance for Finance Lease Receivables (Detail)	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract]
Balance at the beginning of the year	¥ 23,726,420	$ 3,723,193	¥ 19,088,837
Additions	25,839,117	4,054,721	36,282,049
Charge-offs	(17,348,778)	(2,722,401)	(31,644,466)
Balance at the end of the year	¥ 32,216,759	$ 5,055,513	¥ 23,726,420

X

- Definition

A valuation allowance for finance lease receivables that are expected to be uncollectible.

+ References

No definition available.

+ Details

Name:	cang_AllowanceForFinanceLeaseReceivables
Namespace Prefix:	cang_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of recovery of finance lease receivables doubtful of collection that were previously charged off.

+ References

No definition available.

+ Details

Name:	cang_AllowanceForFinanceLeaseReceivablesAdditions
Namespace Prefix:	cang_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of direct write-downs of finance lease receivables charged against the allowance.

+ References

No definition available.

+ Details

Name:	cang_AllowanceForFinanceLeaseReceivablesChargeOffs
Namespace Prefix:	cang_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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