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Organization - Summary of Company's Subsidiaries and VIE (Detail)
 12 Months Ended
Dec. 31, 2021
Organization [Line Items]  
Place of incorporation E9
Cango Group Limited [Member]  
Organization [Line Items]  
Date of incorporation Oct. 31, 2017
Place of incorporation K3
Percentage of legal ownership by the Company 100.00%
Principal activities Investment holding
Express Group Development Limited [Member]  
Organization [Line Items]  
Date of incorporation Jun. 30, 2016
Place of incorporation K3
Percentage of legal ownership by the Company 100.00%
Principal activities Investment holding
Can Gu Long (Shanghai) Information Technology Consultation Service Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation Jan. 25, 2018
Place of incorporation F4
Percentage of legal ownership by the Company 100.00%
Principal activities Investment holding
Shanghai Cango Investment and Management Consultation Service Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation Aug. 30, 2010
Place of incorporation F4
Percentage of legal ownership by the Company 0.00%
Principal activities Provision of automotive financing facilitation, automobile trading transaction and aftermarket service facilitation.