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Revenue Recognition
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Revenues for the three and six months ended June 30, 2021 and 2020 consisted of the following:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(in thousands)
Subject to contracts with customers:
    Investment advisory and services fees
        Base fees$723,717 $569,296 $1,411,408 $1,182,883 
        Performance-based fees53,907 8,907 69,682 17,045 
    Bernstein research services105,655 113,609 224,676 242,832 
    Distribution revenues
        All-in-management fees86,073 75,828 171,255 162,185 
        12b-1 fees20,653 17,830 40,687 37,283 
        Other48,812 26,441 91,196 51,488 
    Other revenues
        Shareholder servicing fees22,383 19,694 44,078 40,537 
        Other2,933 5,790 8,616 10,462 
1,064,133 837,395 2,061,598 1,744,715 
Not subject to contracts with customers:
    Dividend and interest income, net of interest expense
7,924 9,257 15,464 20,403 
    Investment gains (losses)4,181 24,189 6,109 (20,117)
    Other revenues584 608 917 604 
12,689 34,054 22,490 890 
Total net revenues$1,076,822 $871,449 $2,084,088 $1,745,605