Loans Receivable, Net - Schedule Of Loan Receivable Portfolio Based On Floor Rate (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	$ 17,529,542	$ 16,652,824
Non-USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	5,845,640
USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	11,683,902
Fixed rate
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	80,748
Fixed rate | Non-USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	80,748
Fixed rate | USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	0
0.00% or no floor
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	7,294,900
0.00% or no floor | Non-USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	4,769,140
0.00% or no floor | USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	2,525,760
0.01% to 0.24% floor
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	1,830,840
0.01% to 0.24% floor | Non-USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	110,492
0.01% to 0.24% floor | USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	1,720,348
0.25% to 0.99% floor
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	1,294,311
0.25% to 0.99% floor | Non-USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	262,548
0.25% to 0.99% floor | USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	1,031,763
1.00% or more floor
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	7,028,743
1.00% or more floor | Non-USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	622,712
1.00% or more floor | USD [Member]
Disclosure Details Of Loan Receivable Portfolio Based On Floor Rate [Line Items]
Principal balance	$ 6,406,031