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Revenue Recognition
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Revenues for the three and nine months ended September 30, 2023 and 2022 consisted of the following:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
(in thousands)
Subject to contracts with customers:
    Investment advisory and services fees
        Base fees$720,969 $700,809 $2,116,668 $2,145,307 
        Performance-based fees27,982 13,755 82,868 112,515 
    Bernstein research services93,875 91,557 285,760 315,806 
    Distribution revenues
        All-in-management fees72,240 69,717 211,877 224,337 
        12b-1 fees16,388 16,594 47,321 53,547 
        Other distribution fees60,421 61,649 175,727 191,547 
    Other revenues
        Shareholder servicing fees21,539 21,474 62,633 66,282 
        Other2,861 5,383 12,354 13,210 
1,016,275 980,938 2,995,208 3,122,551 
Not subject to contracts with customers:
    Dividend and interest income, net of broker-dealer related interest expense22,391 9,668 69,793 31,960 
    Investment (losses)(6,694)(3,861)(760)(91,105)
    Other revenues84 239 362 709 
15,781 6,046 69,395 (58,436)
Total net revenues$1,032,056 $986,984 $3,064,603 $3,064,115