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Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Examination [Line Items]          
New York City unincorporated business tax rate   4.00%      
UBT statutory rate   4.00% 4.00% 4.00%  
Accrued interest payable recorded on the consolidated statements of financial condition $ 0 $ 0 $ 0 $ 0  
Minimum years that remain open and may be subject to examination vary under local law   1 year      
Maximum years that remain open and may be subject to examination vary under local law   7 years      
Unrecognized Tax Benefits 0 $ 0 2,838,000 $ 2,838,000 $ 2,838,000
Valuation allowance 28,579,000 28,579,000 38,110,000    
Undistributed earnings of non-U.S. corporate subsidiaries 29,600,000 29,600,000      
Foreign Tax Authority          
Income Tax Examination [Line Items]          
Valuation allowance 28,600,000 28,600,000 38,100,000    
Decrease to valuation allowance, tax benefit 22,400,000        
NOL carryforwards $ 44,000,000 44,000,000 $ 30,300,000    
Pro forma          
Income Tax Examination [Line Items]          
Repatriation of foreign earnings   $ 6,200,000