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Components of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule of Other Assets [Line Items]    
Furniture, Equipment and Leasehold Improvements, Net $ 142,083 $ 120,372
Prepaid Expenses 159,419 110,732
Freestanding Derivatives 38,995 44,918
Other 13,756 18,226
Total Other Assets $ 354,253 $ 294,248