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Investment in AB (Tables)
 12 Months Ended
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Changes in AB Holding's Investment in AB
Changes in AB Holding’s investment in AB for the years ended December 31, 2017 and 2016 are as follows:
 
2017
 
2016
 
(in thousands)
Investment in AB as of January 1,
$
1,540,508

 
$
1,576,120

Equity in net income attributable to AB Unitholders
232,393

 
239,389

Changes in accumulated other comprehensive income (loss)
8,562

 
(7,342
)
Cash distributions received from AB
(226,846
)
 
(191,989
)
Additional investments with proceeds from exercises of compensatory options to buy AB Holding Units, net
20,110

 
6,108

Capital contributions to (from) AB
22

 
(200
)
AB Holding Units retired
(162,206
)
 
(184,336
)
AB Holding Units issued to fund long-term incentive compensation plans
135,604

 
103,820

Change in AB Holding Units held by AB for long-term incentive compensation plans
(3,443
)
 
(1,062
)
Investment in AB as of December 31,
$
1,544,704

 
$
1,540,508