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Summary of Significant Accounting Policies - Financial Information of VIE and its Subsidiaries (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Variable Interest Entity [Line Items]        
Net revenue     ¥ 4,218,946  
Net profit ¥ 2,374,518 $ 341,078 2,469,451 ¥ 1,082,907
Net increase in cash, cash equivalents and restricted cash 717,024 102,995 1,010,017 3,076,139
Cash, cash equivalents and restricted cash at beginning of year 5,293,721 760,395 4,283,704 1,207,565
Cash, cash equivalents and restricted cash at end of year 6,010,745 $ 863,390 5,293,721 4,283,704
Beijing Paipairongxin Investment Consulting Co., Ltd [Member]        
Variable Interest Entity [Line Items]        
Net revenue 4,684,436   4,250,978 3,900,454
Net profit 661,808   1,604,530 730,855
Net cash provided by operating activities 74,977   1,356,887 3,233,966
Net cash provided by (used in) investing activities 367,903   (1,031,968) (1,642,454)
Net cash provided by (used in) financing activities 108,972   1,043,899 (31,250)
Net increase in cash, cash equivalents and restricted cash 551,852   1,368,818 1,560,262
Cash, cash equivalents and restricted cash at beginning of year 4,094,087   2,725,269 1,165,007
Cash, cash equivalents and restricted cash at end of year ¥ 4,645,939   ¥ 4,094,087 ¥ 2,725,269