Other Assets and Other Liabilities - Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Accrued expenses	$ 179,275	$ 166,112
Current income taxes and other taxes	138,363	130,261
Employee benefit-related liabilities	51,370	51,051
Deferred lease liabilities		84,449
Unclaimed funds at LFB	17,405	17,746
Deferred revenue	97,964	80,995
Contingent consideration liability		10,009
Securities sold, not yet purchased	12,894	3,929
Other	36,997	32,434
Total	$ 534,268	$ 576,986