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Expense by Nature - Summary of Expenses by Nature (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expenses by nature [abstract]      
Employee benefit expenses ¥ 16,402,993 ¥ 14,145,207 ¥ 12,352,323
Loan origination and servicing expenses 5,712,598 7,091,078 6,530,999
Promotion and advertising expenses 1,685,847 1,221,762 1,149,759
Outsourcing service expenses 1,397,649 1,382,960 997,145
Payment processing expenses 1,197,869 1,204,712 849,763
Trust management fee 1,078,380 504,428 156,266
Business entertainment expenses 619,328 769,834 802,577
Depreciation of right-of-use assets 608,889 604,018 509,026
Taxes and surcharges 534,647 380,460 286,546
Depreciation of property and equipment 193,511 226,862 276,266
Amortization of intangible assets 22,234 31,831 31,967
Others 740,039 1,049,327 1,265,236
Total sales and marketing expenses, general and administrative expenses, operation and servicing expenses, technology and analytics expenses ¥ 30,193,984 ¥ 28,612,479 ¥ 25,207,873