v3.26.3
Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Condensed Balance Sheet Statements, Captions [Line Items]      
Total assets $ 9,843,156 $ 9,277,776  
Liabilities 4,799,209 4,262,658  
Redeemable non-controlling interest 275,066 178,967  
Partners' capital attributable to AB Unitholders 4,768,881 4,836,151 $ 4,740,862
Total liabilities, non-controlling interest and capital 9,843,156 9,277,776  
Company-Sponsored Investment Funds      
Condensed Balance Sheet Statements, Captions [Line Items]      
Cash and cash equivalents 8,137 17,726  
Investments 466,723 330,534  
Other assets 32,026 25,120  
Total assets 506,886 373,380  
Liabilities 31,210 25,281  
Redeemable non-controlling interest 275,066 178,967  
Partners' capital attributable to AB Unitholders 200,610 169,132  
Total liabilities, non-controlling interest and capital 506,886 373,380  
VIEs      
Condensed Balance Sheet Statements, Captions [Line Items]      
Cash and cash equivalents 7,979 17,617  
Investments 440,354 304,035  
Other assets 31,702 24,778  
Total assets 480,035 346,430  
Liabilities 31,108 25,132  
Redeemable non-controlling interest 264,115 169,091  
Partners' capital attributable to AB Unitholders 184,812 152,207  
Total liabilities, non-controlling interest and capital 480,035 346,430  
VOEs      
Condensed Balance Sheet Statements, Captions [Line Items]      
Cash and cash equivalents 158 109  
Investments 26,369 26,499  
Other assets 324 342  
Total assets 26,851 26,950  
Liabilities 102 149  
Redeemable non-controlling interest 10,951 9,876  
Partners' capital attributable to AB Unitholders 15,798 16,925  
Total liabilities, non-controlling interest and capital $ 26,851 $ 26,950