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Summary of Significant Accounting Policies - Schedule of Interest Income, Interest Expense and Loan Provision Losses Related to Loans (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Accounting Policies [Abstract]        
Interest income ¥ 1,342,289   ¥ 316,193 ¥ 46,975
Less: Provision for loan losses (235,620)   (60,085) (15,598)
Net interest income (expense) and provision for loan losses ¥ 1,106,669 $ 158,963 ¥ 256,108 ¥ 31,377