Investments - Income from Equity Method Investments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	$ 22,910		$ 27,790
Private Equity Funds | AAA Investments
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	124		27
Private Equity Funds | Apollo Investment Fund V, L.P. (“Fund V”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	10		7
Private Equity Funds | Apollo Investment Fund VI, L.P. (“Fund VI”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(470)		1,078
Private Equity Funds | Apollo Investment Fund VII, L.P. (“Fund VII”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	9,235		20,413
Private Equity Funds | Apollo Investment Fund VIII, L.P. (“Fund VIII”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(234)		0
Private Equity Funds | Apollo Natural Resources Partners, L.P. (“ANRP”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(14)		11
Private Equity Funds | AION Capital Partners Limited (“AION”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	2,787		184
Private Equity Funds | Apollo Asia Private Credit Fund, L.P. (“APC”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	2		1
Credit Funds | Apollo Special Opportunities Managed Account, L.P. (“SOMA”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	450		384
Credit Funds | Apollo Value Investment Fund, L.P. (“VIF”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	4		7
Credit Funds | Apollo Strategic Value Fund, L.P. (“SVF”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(1)		3
Credit Funds | Apollo Credit Liquidity Fund, L.P. (“ACLF”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	177		704
Credit Funds | Apollo Credit Opportunity Fund I, L.P. (“COF I”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	216		3,574
Credit Funds | Apollo Credit Opportunity Fund II, L.P. (“COF II”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	166		888
Credit Funds | Apollo Credit Opportunity Fund III, L.P. (COF III)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	658		0
Credit Funds | Apollo European Principal Finance Fund, L.P. (“EPF I”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	1,303		(331)
Credit Funds | Apollo European Principal Finance Fund II, L.P. (“EPF II”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(97)		63
Credit Funds | Apollo Investment Europe II, L.P. (“AIE II”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	146		57
Credit Funds | Apollo Palmetto Strategic Partnership, L.P. (“Palmetto”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	861		583
Credit Funds | Apollo Senior Floating Rate Fund Inc. (“AFT”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	1		8
Credit Funds | Apollo Residential Mortgage, Inc. (“AMTG”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	88	[1]	486	[2]
Credit Funds | Apollo European Credit, L.P. (“AEC”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	117		76
Credit Funds | Apollo European Strategic Investments, L.P. (“AESI”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	122		152
Credit Funds | Apollo Centre Street Partnership, L.P. (“ACSP”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	512		181
Credit Funds | Apollo Investment Corporation (“AINV”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	3,176	[1]	(627)	[2]
Credit Funds | Apollo SK Strategic Investments, L.P. (SK)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	80		26
Credit Funds | Apollo SPN Investments I, L.P.
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	182		(413)
Credit Funds | Apollo Tactical Income Fund Inc. (“AIF”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(1)		5
Credit Funds | Apollo Franklin Partnership, L.P. (Franklin Fund)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	216		0
Credit Funds | Apollo Zeus Strategic Investments, L.P. (Zeus)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	148		0
Real Estate | Apollo Commercial Real Estate Finance, Inc. (“ARI”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	364	[1]	223	[2]
Real Estate | AGRE U.S. Real Estate Fund, L.P.
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	292		14
Real Estate | CPI Capital Partners North America L.P.
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	0		58
Real Estate | CPI Capital Partners Asia Pacific, L.P.
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(1)		2
Real Estate | Apollo GSS Holding (Cayman), L.P.
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	81		(4)
Real Estate | BEA/AGRE China Real Estate Fund, L.P.
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(2)		0
Other Equity Method Investments | VC Holdings, L.P. Series A (“Vantium A/B”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	0		13
Other Equity Method Investments | VC Holdings, L.P. Series C (“Vantium C”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	3,687		(8)
Other Equity Method Investments | VC Holdings, L.P. Series D (“Vantium D”)
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	(1,475)		(47)
Other Equity Method Investments | Other
Income Loss From Equity Method Investments [Line Items]
(Loss) income from equity method investment	$ 0		$ (8)

[1] Amounts are for the three months ended December 31, 2013, respectively.

[2] Amounts are for the three months ended December 31, 2012, respectively.