|
Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
|
3 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2014
|
| Income Taxes [Abstract] |
|
|
| New York City unincorporated business tax (in hundredths) |
4.00% |
|
| Computation of equity in net income attributable to AllianceBernstein Unitholders [Abstract] |
|
|
| Net income attributable to AB Unitholders |
$ 141,469 |
$ 116,725 |
| Multiplied by: weighted average equity ownership interest (in hundredths) |
36.50% |
35.40% |
| Equity in net income attributable to AB Unitholders |
51,616 |
41,371 |
| Computation of income tax [Abstract] |
|
|
| AB qualifying revenues |
544,774 |
499,129 |
| Multiplied by: weighted average equity ownership interest for calculating tax (in hundredths) |
31.10% |
29.30% |
| Multiplied by: federal tax (in hundredths) |
3.50% |
3.50% |
| Federal income taxes |
5,927 |
5,112 |
| State income taxes |
104 |
100 |
| Total income taxes |
$ 6,031 |
$ 5,212 |
| Effective tax rate (in hundredths) |
11.70% |
12.60% |
| Changes in components for calculation of income tax [Abstract] |
|
|
| Increase in net income attributable to AllianceBernstein Unitholders (in hundredths) |
21.20% |
|
| Increase in equity in net income attributable to AllianceBernstein Unitholders (in hundredths) |
24.80% |
|
| Change in AllianceBernstein qualifying revenues (in hundredths) |
9.10% |
|
| Increase in income taxes (in hundredths) |
15.70% |
|