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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Segments
shares
Dec. 31, 2019
USD ($)
Segments
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
CNY (¥)
Mar. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
shares
Oct. 31, 2019
CNY (¥)
Jul. 31, 2019
CNY (¥)
Jul. 31, 2019
USD ($)
Apr. 30, 2019
CNY (¥)
Jan. 01, 2019
CNY (¥)
Oct. 31, 2018
CNY (¥)
Oct. 31, 2017
CNY (¥)
Summary Of Significant Accounting Policies [Line Items]                            
Exchange rates used for translation   6.9762   6.8632     6.9762              
Convenience translation rate   6.9618         6.9618              
Restricted cash   ¥ 3,686,203,000   ¥ 3,677,557,000     $ 529,490              
Cash collateral for borrowed securities   251,853,000   26,000,000                    
Cash held in escrow accounts   44,367,000   10,436,000                    
Insignificant equity method investments   803,691,000 $ 115,443 155,286,000 ¥ 9,953,000                  
Disposed equity method investments   20,000,000   0 0                  
Gain on disposed equity method investments   10,621,000   0 0                  
Disposed non marketable equity securities   1,508   0 0                  
Loss on disposed non marketable equity securities   7,000   0 0                  
Cash consideration for equity interests   ¥ 96,622,000   81,000,000                    
Acquired of equity interest   10.00%         10.00%              
Impairment of long-lived assets   ¥ 4,600,000   0 0                  
Gain from quality assurance fund   ¥ 98,400,000 $ 14,100 510,900,000 5,900,000                  
Percentage of principal amount invested received   0.10% 0.10%                      
Restricted cash transferred to cash and cash equivalents                           ¥ 45,567,000
Reversal of gains         213,958,000                  
Expected discretionary payment to investor reserve       39,041,000 107,660,000                  
Discretionary payment to investor reserve       68,619,000                    
Operating revenues       ¥ 4,218,946,000                    
Percentage on statutory reserve contribution from net profit   50.00% 50.00%                      
Number of reportable segments | Segments   1 1                      
Number of geographical segments | Segments   0 0                      
Treasury stock, common shares | shares   20,634,265   46,301,000     20,634,265              
Appropriations to the general reserve   ¥ 61,192,000   ¥ 200,916,000 39,428,000                  
Maximum potential future payments of outstanding loans   0         $ 0              
Equity method investment impairment   0   0 0                  
Reclassified provision for loan receivables   299,504,000                        
Prior period reclassification amount       192,749,000 46,586,000                  
Operating lease right of use asset   95,786,000         $ 13,759         ¥ 127,066,000    
Operating lease liability   85,143,000                   ¥ 118,420,000    
Cummulative effect on retained earnings       176,494,000                    
Non-marketable equity investments   856,211,000   86,501,000                    
Non-marketable Equity Method Investments [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Amount of fair value adjustment   0   77,000                    
Non-marketable Equity Investments In Financial Industry [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Non-marketable equity investments   700,000,000                        
Fujian Zhiyun [Member] | Subsequent Event [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Net assets of guarantee company           ¥ 0                
Individual Investors With Capped Obligations [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash       2,414,449,000                    
Institutional Investors Without Uncapped Obligations [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash   1,473,749,000                        
Shanghai Yi Yang Automobile Service Co Ltd [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash consideration for equity interests                         ¥ 30,000,000  
Acquired of equity interest                         5.00%  
Shanghai Zhan Lue Data Technology Co Ltd [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash consideration for equity interests                     ¥ 30,000,000      
Acquired of equity interest                     6.98%      
Fan Sheng Limited [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash consideration for equity interests                 ¥ 30,000,000 $ 4,370        
Acquired of equity interest                 3.22% 3.22%        
Two Private Equity Fund One [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash consideration for equity interests                 ¥ 50,000,000          
Two Private Equity Fund Two [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash consideration for equity interests                 ¥ 20,000,000          
Guarantee and Quality Assurance Fund [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash   21,794,353,000   19,350,705,000                    
Investor Reserve Funds [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash   41,958,000   17,971,000                    
Cash Received From Investors Or Borrowers Not Yet Disbursed [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash   684,630,000   905,034,000                    
Cash Received Via Consolidated Trust Not Yet Distributed [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash   799,646,000   303,667,000                    
Demand Deposits [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Restricted cash               ¥ 390,000,000            
Accounting Standards Update 2016-13 [Member] | Subsequent Event [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Increase in financial instruments ¥ 0                          
Cummulative effect on retained earnings ¥ 882,964,000                          
Grants [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Operating revenues   62,517,000   53,739,000 1,682,000                  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cumulative effect of initially applying the revenue standard on retained earnings   176,500,000                        
Operating revenues       511,077,000                    
Other Income [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash held in escrow accounts   52,863,000                        
Realized and unrealized gain on short-term investments       96,061,000 35,516,000                  
Selling and Marketing Expense [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Advertising and online marketing expenses   ¥ 710,203,000   702,508,000 779,737,000                  
Maximum [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Cash and cash equivalents, original maturities period   3 months 3 months                      
Insignificant equity method investments   ¥ 25,000,000   25,000,000 25,000,000                  
Insignificant non-marketable equity method investments   ¥ 13,952,000   13,952,000 13,952,000                  
Minimum [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Statutory reserve contribution percentage on net profit   10.00% 10.00%                      
Insignificant equity method investments   ¥ 5,000,000   5,000,000 5,000,000                  
Insignificant non-marketable equity method investments   ¥ 209,000   ¥ 209,000 ¥ 209,000                  
Beijing Prosper Investment Consulting Co., Ltd [Member]                            
Summary Of Significant Accounting Policies [Line Items]                            
Percentage to pay service fees by VIE's   100.00% 100.00%