Long-term Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Compensation Related Costs [Abstract]

Summary of Option Awards Activity

The option-related activity in our equity compensation plans during 2019 is as follows:

	Options to Buy AB Holding Units		Weighted Average Exercise  Price Per Option		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2018	671,243		$	22.83	1.6
Granted	—		—
Exercised	(511,894	)	22.49
Forfeited	—		—
Expired	—		—
Outstanding as of December 31, 2019	159,349		23.93		2.1	$	1.0
Exercisable as of December 31, 2019	141,163		24.09		2.1	0.9
Vested or expected to vest as of December 31, 2019	159,349		23.93		2.1	1.0

Summary of Activity of Unvested Restricted Holding Units

Changes in unvested restricted AB Holding Units during 2019 are as follows:

	AB Holding Units		Weighted Average Grant Date Fair Value per AB Holding Unit
Unvested as of December 31, 2018	20,214,389		$	25.12
Granted	7,739,318		28.75
Vested	(8,260,466	)	24.38
Forfeited	(406,161	)	25.86
Unvested as of December 31, 2019	19,287,080		26.88