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Finance Lease Receivables, Net - Summary of Movement of Allowance for Finance Lease Receivables (Detail) | 12 Months Ended
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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

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration