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Valuation and Qualifying Account - Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017

Description
 
Balance at Beginning
of Period
 
Credited to
Costs and
Expenses
 
Deductions
 
 
 
Balance at End
of Period
 
 
(in thousands)
For the year ended December 31, 2017
 
$
513

 
$
150

 
$
252

 
(a)
 
$
411

 
 
 
 
 
 
 
 
 
 
 
For the year ended December 31, 2018
 
$
411

 
$
—

 
$
16

 
(b)
 
$
395

 
 
 
 
 
 
 
 
 
 
 
For the year ended December 31, 2019
 
$
395

 
$
132

 
$
218

 
(c)
 
$
309


(a)
Includes accounts written-off as uncollectible of $252.
(b)
Includes accounts written-off as uncollectible of $16.
(c)
Includes accounts written-off as uncollectible of $218.