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Corporate Investments and Funds Held For Clients - Summary of Unrealized Gains (Losses) and Fair Values of Available-for-Sale Securities that have been in Unrealized Gain (Loss) Position for Period of Less than and Greater than 12 Months (Details) - Available-for-sale Securities [Member] - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Corporate Investments And Funds Held For Clients [Line Items]    
Securities in unrealized gain position for less than 12 months, Gross unrealized gains $ 2  
Securities in unrealized gain position for less than 12 months, Fair value 24,928  
Gross unrealized gains 2  
Fair value 24,928  
Securities in unrealized loss position for greater than 12 months, Gross unrealized losses   $ (1,256)
Securities in unrealized loss position for greater than 12 months, Fair value   173,631
Gross unrealized losses   (1,256)
Fair value   173,631
U.S. Treasury Securities [Member]    
Corporate Investments And Funds Held For Clients [Line Items]    
Securities in unrealized gain position for less than 12 months, Gross unrealized gains 2  
Securities in unrealized gain position for less than 12 months, Fair value 24,928  
Gross unrealized gains 2  
Fair value $ 24,928  
Securities in unrealized loss position for greater than 12 months, Gross unrealized losses   (1,256)
Securities in unrealized loss position for greater than 12 months, Fair value   173,631
Gross unrealized losses   (1,256)
Fair value   $ 173,631