Furniture, Equipment and Leasehold Improvements, Net - Schedule of Furniture, Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Furniture, equipment and leasehold improvements [Abstract]
Furniture, equipment and leasehold improvements, gross	$ 885,197	$ 841,046
Less: Accumulated depreciation and amortization	(716,022)	(693,172)
Furniture, equipment and leasehold improvements, net	169,175	147,874
Furniture and equipment
Furniture, equipment and leasehold improvements [Abstract]
Furniture, equipment and leasehold improvements, gross	584,161	556,966
Leasehold improvements
Furniture, equipment and leasehold improvements [Abstract]
Furniture, equipment and leasehold improvements, gross	$ 301,036	$ 284,080