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Valuation and Qualifying Account - Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2020
AllianceBernstein L.P.  
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Account - Allowance for Doubtful Accounts
AllianceBernstein L.P.
Valuation and Qualifying Account - Allowance for Doubtful Accounts
For the Three Years Ending December 31, 2020, 2019 and 2018
DescriptionBalance at Beginning
of Period		Credited to
Costs and
Expenses		Deductions Balance at End
of Period
 (in thousands)
For the year ended December 31, 2020$309 $100 $98 (a)$311 
For the year ended December 31, 2019$395 $132 $218 (b)$309 
For the year ended December 31, 2018$411 $— $16 (c)$395 

(a)Includes accounts written-off as uncollectible of $98.
(b)Includes accounts written-off as uncollectible of $218.
(c)Includes accounts written-off as uncollectible of $16.