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Net Income Per Unit (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Income Per Unit
 
Years Ended December 31,
 
2019
 
2018
 
2017
 
(in thousands, except per unit amounts)
Net income - basic
$
238,563

 
$
242,397

 
$
207,422

Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options
79

 
447

 
680

Net income - diluted
$
238,642

 
$
242,844

 
$
208,102

 
 
 
 
 
 
Weighted average units outstanding - basic
95,884

 
97,041

 
94,733

Dilutive effect of compensatory options
44

 
251

 
430

Weighted average units outstanding - diluted
95,928

 
97,292

 
95,163

 
 
 
 
 
 
Basic net income per unit
$
2.49

 
$
2.50

 
$
2.19

Diluted net income per unit
$
2.49

 
$
2.50

 
$
2.19