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Condensed Statements of Changes in Partners’ Capital - USD ($)
$ in Thousands
Total
AB Holding Units held by AB for long-term incentive compensation plans
Accumulated Other Comprehensive (Loss)
General Partner’s Capital
Limited Partners’ Capital
Balance, beginning of period at Dec. 31, 2023   $ (30,185) $ (42,044) $ 1,327 $ 2,147,147
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 317,940     278 317,662
Cash distributions to Unitholders       (221) (253,702)
Retirement of AB Holding Units         (66,477)
Issuance of AB Holding Units for long-term incentive compensation plan awards         20,430
Retirement of AB Holding Units in connection with EQH Amended Exchange Agreement 0       0
Change in AB Holding Units held by AB for fund long-term incentive compensation plans (net purchases)   (3,205)      
Foreign currency translation adjustment, net of tax 6,795   6,795    
Changes in employee benefit related items, net of tax 326   326    
Balance, end of period at Sep. 30, 2024 2,098,131 (33,390) (34,923) 1,384 2,165,060
Balance, beginning of period at Jun. 30, 2024   (36,646) (42,511) 1,343 2,162,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 127,195     112 127,083
Cash distributions to Unitholders       (71) (81,141)
Retirement of AB Holding Units         (44,063)
Issuance of AB Holding Units for long-term incentive compensation plan awards         313
Retirement of AB Holding Units in connection with EQH Amended Exchange Agreement         0
Change in AB Holding Units held by AB for long-term incentive compensation plans (net reissuances)   3,256      
Foreign currency translation adjustment, net of tax 7,473   7,473    
Changes in employee benefit related items, net of tax 115   115    
Balance, end of period at Sep. 30, 2024 2,098,131 (33,390) (34,923) 1,384 2,165,060
Balance, beginning of period at Dec. 31, 2024 2,031,862 (23,363) (41,424) 1,401 2,095,248
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 218,033     212 217,821
Cash distributions to Unitholders       (262) (274,062)
Retirement of AB Holding Units (43,313)       (43,313)
Issuance of AB Holding Units for long-term incentive compensation plan awards 48,878       48,878
Retirement of AB Holding Units in connection with EQH Amended Exchange Agreement 820,188       (820,188)
Change in AB Holding Units held by AB for fund long-term incentive compensation plans (net purchases)   (7,652)      
Foreign currency translation adjustment, net of tax 14,871   14,871    
Changes in employee benefit related items, net of tax 8,728   8,728    
Balance, end of period at Sep. 30, 2025 1,176,895 (31,015) (17,825) 1,351 1,224,384
Balance, beginning of period at Jun. 30, 2025   (35,382) (18,874) 1,346 2,034,533
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 73,751     82 73,669
Cash distributions to Unitholders       (77) (69,018)
Retirement of AB Holding Units         (3,925)
Issuance of AB Holding Units for long-term incentive compensation plan awards         9,313
Retirement of AB Holding Units in connection with EQH Amended Exchange Agreement         (820,188)
Change in AB Holding Units held by AB for long-term incentive compensation plans (net reissuances)   4,367      
Foreign currency translation adjustment, net of tax 1,073   1,073    
Changes in employee benefit related items, net of tax (24)   (24)    
Balance, end of period at Sep. 30, 2025 $ 1,176,895 $ (31,015) $ (17,825) $ 1,351 $ 1,224,384