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Expense by Nature - Summary of Sales and Marketing Expenses (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sales and marketing expense      
Borrower acquisition expenses ¥ 10,119,525 ¥ 11,506,402 ¥ 8,714,516
General sales and marketing expenses 7,196,563 5,487,267 5,327,741
Investor acquisition and retention expenses 676,984 819,888 888,839
Sales and marketing expenses ¥ 17,993,072 ¥ 17,813,557 ¥ 14,931,096