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Loans Receivable, Net - Loans Receivable Based On Our Internal Risk Ratings, Separated By Year Of Origination (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Loans receivable $ 16,363,608 $ 16,164,801        
CECL reserve 112,694 112,694        
Loans receivable, net 16,250,914 $ 16,164,801        
Loans Receivable [Member]            
Financing receivable, originated in current fiscal year 752,439          
Financing receivable, originated in fiscal year before latest fiscal year     $ 5,722,532      
Financing receivable, originated two years before latest fiscal year       $ 6,603,469    
Financing receivable, originated three years before latest fiscal year         $ 2,150,020  
Financing receivable, originated four years before latest fiscal year           $ 546,081
Financing receivable, originated five or more years before latest fiscal year 589,067          
Loans receivable 16,363,608          
CECL reserve (112,694)          
Loans receivable, net 16,250,914          
U.S. Loans [Member]            
Financing receivable, originated in current fiscal year 657,648          
Financing receivable, originated in fiscal year before latest fiscal year     2,817,039      
Financing receivable, originated two years before latest fiscal year       4,859,899    
Financing receivable, originated three years before latest fiscal year         2,064,469  
Financing receivable, originated four years before latest fiscal year           441,650
Financing receivable, originated five or more years before latest fiscal year 505,582          
Loans receivable 11,346,287          
Non-US Loans [Member]            
Financing receivable, originated in current fiscal year 94,791          
Financing receivable, originated in fiscal year before latest fiscal year     2,610,759      
Financing receivable, originated two years before latest fiscal year       493,284    
Financing receivable, originated three years before latest fiscal year         85,551  
Financing receivable, originated four years before latest fiscal year           104,431
Financing receivable, originated five or more years before latest fiscal year 0          
Loans receivable 3,388,816          
Unique Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     294,734      
Financing receivable, originated two years before latest fiscal year       1,250,286    
Financing receivable, originated five or more years before latest fiscal year 83,485          
Loans receivable 1,628,505          
Risk Rating One [Member] | Loans Receivable [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     195,684      
Financing receivable, originated two years before latest fiscal year       89,463    
Financing receivable, originated three years before latest fiscal year         43,964  
Financing receivable, originated four years before latest fiscal year           24,001
Loans receivable 353,112          
Risk Rating One [Member] | U.S. Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     195,684      
Financing receivable, originated three years before latest fiscal year         43,964  
Financing receivable, originated four years before latest fiscal year           24,001
Loans receivable 263,649          
Risk Rating One [Member] | Non-US Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated two years before latest fiscal year       89,463    
Loans receivable 89,463          
Risk Rating One [Member] | Unique Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Risk Rating Two [Member] | Loans Receivable [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     93,895      
Financing receivable, originated two years before latest fiscal year       1,879,598    
Financing receivable, originated three years before latest fiscal year         817,889  
Financing receivable, originated four years before latest fiscal year           79,668
Financing receivable, originated five or more years before latest fiscal year 224,393          
Loans receivable 3,095,443          
Risk Rating Two [Member] | U.S. Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     93,895      
Financing receivable, originated two years before latest fiscal year       1,879,598    
Financing receivable, originated three years before latest fiscal year         732,338  
Financing receivable, originated four years before latest fiscal year           79,668
Financing receivable, originated five or more years before latest fiscal year 224,393          
Loans receivable 3,009,892          
Risk Rating Two [Member] | Non-US Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated three years before latest fiscal year         85,551  
Loans receivable 85,551          
Risk Rating Two [Member] | Unique Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Risk Rating Three [Member] | Loans Receivable [Member]            
Financing receivable, originated in current fiscal year 686,633          
Financing receivable, originated in fiscal year before latest fiscal year     4,739,453      
Financing receivable, originated two years before latest fiscal year       2,363,861    
Financing receivable, originated three years before latest fiscal year         1,224,994  
Financing receivable, originated four years before latest fiscal year           332,323
Financing receivable, originated five or more years before latest fiscal year 311,890          
Loans receivable 9,659,154          
Risk Rating Three [Member] | U.S. Loans [Member]            
Financing receivable, originated in current fiscal year 591,842          
Financing receivable, originated in fiscal year before latest fiscal year     2,352,919      
Financing receivable, originated two years before latest fiscal year       1,668,359    
Financing receivable, originated three years before latest fiscal year         1,224,994  
Financing receivable, originated four years before latest fiscal year           227,892
Financing receivable, originated five or more years before latest fiscal year 228,405          
Loans receivable 6,294,411          
Risk Rating Three [Member] | Non-US Loans [Member]            
Financing receivable, originated in current fiscal year 94,791          
Financing receivable, originated in fiscal year before latest fiscal year     2,386,534      
Financing receivable, originated two years before latest fiscal year       403,821    
Financing receivable, originated four years before latest fiscal year           104,431
Loans receivable 2,989,577          
Risk Rating Three [Member] | Unique Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     0      
Financing receivable, originated two years before latest fiscal year       291,681    
Financing receivable, originated five or more years before latest fiscal year 83,485          
Loans receivable 375,166          
Risk Rating Four [Member] | Loans Receivable [Member]            
Financing receivable, originated in current fiscal year 65,806          
Financing receivable, originated in fiscal year before latest fiscal year     693,500      
Financing receivable, originated two years before latest fiscal year       2,270,547    
Financing receivable, originated three years before latest fiscal year         63,173  
Financing receivable, originated four years before latest fiscal year           110,089
Financing receivable, originated five or more years before latest fiscal year 52,784          
Loans receivable 3,255,899          
Risk Rating Four [Member] | U.S. Loans [Member]            
Financing receivable, originated in current fiscal year 65,806          
Financing receivable, originated two years before latest fiscal year     174,541 1,311,942    
Financing receivable, originated three years before latest fiscal year         $ 63,173  
Financing receivable, originated four years before latest fiscal year           $ 110,089
Financing receivable, originated five or more years before latest fiscal year 52,784          
Loans receivable 1,778,335          
Risk Rating Four [Member] | Non-US Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     224,225      
Loans receivable 224,225          
Risk Rating Four [Member] | Unique Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Financing receivable, originated in fiscal year before latest fiscal year     $ 294,734      
Financing receivable, originated two years before latest fiscal year       $ 958,605    
Loans receivable 1,253,339          
Risk Rating Five [Member] | Loans Receivable [Member]            
Financing receivable, originated in current fiscal year 0          
Risk Rating Five [Member] | U.S. Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Risk Rating Five [Member] | Non-US Loans [Member]            
Financing receivable, originated in current fiscal year 0          
Risk Rating Five [Member] | Unique Loans [Member]            
Financing receivable, originated in current fiscal year $ 0