EQUITY-BASED COMPENSATION - Reconciliation of Equity-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 49,726	$ 42,665	$ 161,268	$ 132,404
Non-Controlling Interests in Apollo Operating Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			3,898	8,576
Less other equity-based compensation awards			(3,898)	(8,576)
Capital increase related to equity-based compensation			0	0
Allocated to Apollo Global Management, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			157,370	123,828
Less other equity-based compensation awards			(23,520)	(21,639)
Capital increase related to equity-based compensation			133,850	102,189
RSUs, share options and restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			152,998	113,254
RSUs, share options and restricted share awards | Non-Controlling Interests in Apollo Operating Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			$ 0	$ 0
Non-Controlling Interest % in Apollo Operating Group			0.00%	0.00%
RSUs, share options and restricted share awards | Allocated to Apollo Global Management, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			$ 152,998	$ 113,254
Other equity-based compensation awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			8,270	19,150
Other equity-based compensation awards | Non-Controlling Interests in Apollo Operating Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			$ 3,898	$ 8,576
Non-Controlling Interest % in Apollo Operating Group			47.10%	44.80%
Other equity-based compensation awards | Allocated to Apollo Global Management, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation			$ 4,372	$ 10,574