Long-term Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Compensation Related Costs [Abstract]

Schedule of Black-Scholes Option Assumptions Valuation Model

	2016
Risk-free interest rate	1.3	%
Expected cash distribution yield	7.1	%
Historical volatility factor	31.0	%
Expected term	6.0 years

Summary of Option Awards Activity

The option-related activity in our equity compensation plans during 2018 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, 2017	3,082,470		$	52.37	1.2
Granted	—		—
Exercised	(889,119	)	18.66
Forfeited	—		—
Expired	(1,522,108	)	85.09
Outstanding as of December 31, 2018	671,243		22.83		1.6	$	3.0
Exercisable as of December 31, 2018	634,877		22.84		1.5	2.8
Vested or expected to vest as of December 31, 2018	671,243		22.83		1.6	3.0

Summary of Activity of Unvested Restricted Holding Units

Changes in unvested restricted AB Holding Units during 2018 are as follows:

	AB Holding Units		Weighted Average Grant Date Fair Value per AB Holding Unit
Unvested as of December 31, 2017	19,072,910		$	23.82
Granted	9,123,321		26.64
Vested	(7,128,611	)	23.72
Forfeited	(853,231	)	24.02
Unvested as of December 31, 2018	20,214,389		25.12