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Fixed Assets, Net (Tables)
3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Summary of components of fixed assets, net
Fixed assets, net consisted of the following (in thousands):
March 31, 2021December 31, 2020
Leasehold improvements, furniture and fixtures, and other fixed assets$148,709 $126,428 
Software, including software development costs31,691 30,928 
Computer and communications equipment26,396 26,168 
Total, cost206,796 183,524 
Accumulated depreciation and amortization(91,344)(87,157)
Total, net$115,452 $96,367