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Fixed Assets, Net (Tables)
3 Months Ended
Mar. 31, 2024
Property, Plant and Equipment [Abstract]  
Summary of Components of Fixed Assets, Net
Fixed assets, net consisted of the following (in thousands):
March 31, 2024December 31, 2023
Leasehold improvements, furniture and fixtures, and other fixed assets$246,185 $245,262 
Software, including software development costs59,238 56,883 
Computer and communications equipment38,049 37,693 
Total, cost343,472 339,838 
Accumulated depreciation and amortization(169,787)(161,803)
Total, net$173,685 $178,035