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Subsequent Events (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jul. 31, 2024
Jul. 29, 2024
Apr. 01, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Subsequent Event [Line Items]                  
Dividends declared per share of common stock (in dollars per share)       $ 0.02 $ 0.01 $ 0.03 $ 0.02    
Revolving credit facility | BGC Credit Agreement | Related Party                  
Subsequent Event [Line Items]                  
Repayment of outstanding borrowings     $ 275,000,000.0            
Line of credit facility, outstanding amount     $ 275,000,000.0 $ 0   $ 0   $ 275,000,000.0 $ 0
Revolving credit facility | BGC Credit Agreement | Related Party | Cantor                  
Subsequent Event [Line Items]                  
Line of credit facility, outstanding amount       $ 180,000,000   $ 180,000,000      
Subsequent event                  
Subsequent Event [Line Items]                  
Dividends declared per share of common stock (in dollars per share)   $ 0.02              
Subsequent event | Revolving credit facility | BGC Credit Agreement | Related Party                  
Subsequent Event [Line Items]                  
Repayment of outstanding borrowings $ 18,000,000.0