Investments - Other Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Income Loss From Equity Method Investments [Line Items]
Other investments	$ 404,028		$ 381,856
Other investments % of Ownership	0.06%
Investments in and Advances to Affiliates, Amount of Equity	56,102		57,249
AAA Investments
Income Loss From Equity Method Investments [Line Items]
Other investments % of Ownership			72.50%
Private Equity Funds | AAA Investments
Income Loss From Equity Method Investments [Line Items]
Other investments	1,293		1,168
Other investments % of Ownership	0.057%		0.057%
Private Equity Funds | Fund IV
Income Loss From Equity Method Investments [Line Items]
Other investments	8		9
Other investments % of Ownership	0.023%		0.019%
Private Equity Funds | Fund V
Income Loss From Equity Method Investments [Line Items]
Other investments	97		94
Other investments % of Ownership	0.019%		0.02%
Private Equity Funds | Fund VI
Income Loss From Equity Method Investments [Line Items]
Other investments	8,992		9,964
Other investments % of Ownership	0.104%		0.103%
Private Equity Funds | Fund VII
Income Loss From Equity Method Investments [Line Items]
Other investments	127,509		137,960
Other investments % of Ownership	1.263%		1.258%
Private Equity Funds | Fund VIII
Income Loss From Equity Method Investments [Line Items]
Other investments	16,169		4,310
Other investments % of Ownership	3.098%		3.996%
Private Equity Funds | Apollo Natural Resources Partners, L.P. (“ANRP”)
Income Loss From Equity Method Investments [Line Items]
Other investments	3,898		3,735
Other investments % of Ownership	0.821%		0.831%
Private Equity Funds | AION
Income Loss From Equity Method Investments [Line Items]
Other investments	11,365		6,425
Other investments % of Ownership	7.135%		9.97%
Private Equity Funds | Apollo Asia Private Credit Fund, L.P. (“APC”)
Income Loss From Equity Method Investments [Line Items]
Other investments	35		49
Other investments % of Ownership	0.045%		0.046%
Credit Funds | Apollo Special Opportunities Managed Account, L.P. (“SOMA”)
Income Loss From Equity Method Investments [Line Items]
Other investments	7,282		6,833
Other investments % of Ownership	0.843%		0.853%
Credit Funds | Apollo Value Investment Fund, L.P. (“VIF”)
Income Loss From Equity Method Investments [Line Items]
Other investments	155		151
Other investments % of Ownership	0.07%		0.124%
Credit Funds | Apollo Strategic Value Fund, L.P. (“SVF”)
Income Loss From Equity Method Investments [Line Items]
Other investments	14		17
Other investments % of Ownership	0.032%		0.079%
Credit Funds | Apollo Credit Liquidity Fund, L.P. (“ACLF”)
Income Loss From Equity Method Investments [Line Items]
Other investments	4,737		4,559
Other investments % of Ownership	3.297%		3.341%
Credit Funds | Apollo Credit Opportunity Fund I, L.P. (“COF I”)
Income Loss From Equity Method Investments [Line Items]
Other investments	10,016		10,077
Other investments % of Ownership	1.85%		1.85%
Credit Funds | Apollo Credit Opportunity Fund II, L.P. (“COF II”)
Income Loss From Equity Method Investments [Line Items]
Other investments	3,421		5,015
Other investments % of Ownership	1.413%		1.428%
Credit Funds | Apollo Credit Opportunity Fund III, L.P. (COF III)
Income Loss From Equity Method Investments [Line Items]
Other investments	11,748		6,720
Other investments % of Ownership	2.444%		2.45%
Credit Funds | Apollo European Principal Finance Fund, L.P. (“EPF I”)
Income Loss From Equity Method Investments [Line Items]
Other investments	16,585		19,332
Other investments % of Ownership	1.367%		1.363%
Credit Funds | Apollo European Principal Finance Fund II, L.P. (“EPF II”)
Income Loss From Equity Method Investments [Line Items]
Other investments	32,739		23,212
Other investments % of Ownership	1.838%		1.994%
Credit Funds | Apollo Investment Europe II, L.P. (“AIE II”)
Income Loss From Equity Method Investments [Line Items]
Other investments	4,642		4,500
Other investments % of Ownership	2.834%		2.772%
Credit Funds | Apollo Palmetto Strategic Partnership, L.P. (“Palmetto”)
Income Loss From Equity Method Investments [Line Items]
Other investments	16,915		16,054
Other investments % of Ownership	1.186%		1.186%
Credit Funds | Apollo Senior Floating Rate Fund Inc. (“AFT”)
Income Loss From Equity Method Investments [Line Items]
Other investments	96		95
Other investments % of Ownership	0.034%		0.034%
Credit Funds | Apollo Residential Mortgage, Inc. (“AMTG”)
Income Loss From Equity Method Investments [Line Items]
Other investments	4,047	[1],[2]	4,015	[1],[2]
Other investments % of Ownership	0.637%	[1],[2]	0.632%	[1],[2]
Credit Funds | Apollo European Credit, L.P. (“AEC”)
Income Loss From Equity Method Investments [Line Items]
Other investments	2,580		2,482
Other investments % of Ownership	1.076%		1.23%
Credit Funds | Apollo European Strategic Investments, L.P. (“AESI”)
Income Loss From Equity Method Investments [Line Items]
Other investments	4,111		3,732
Other investments % of Ownership	0.99%		0.956%
Credit Funds | Apollo Centre Street Partnership, L.P. (“ACSP”)
Income Loss From Equity Method Investments [Line Items]
Other investments	9,056		7,690
Other investments % of Ownership	2.474%		2.465%
Credit Funds | Apollo Investment Corporation (“AINV”)
Income Loss From Equity Method Investments [Line Items]
Other investments	59,128	[1]	55,951	[1]
Other investments % of Ownership	3.004%	[1]	2.933%	[1]
Credit Funds | Apollo SK Strategic Investments, L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	1,794		1,714
Other investments % of Ownership	1.012%		0.997%
Credit Funds | Apollo SPN Investments I, L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	4,353		4,457
Other investments % of Ownership	0.721%		0.828%
Credit Funds | CION Investment Corporation
Income Loss From Equity Method Investments [Line Items]
Other investments	1,000		1,000
Other investments % of Ownership	0.463%		0.716%
Credit Funds | AIF
Income Loss From Equity Method Investments [Line Items]
Other investments	93		94
Other investments % of Ownership	0.036%		0.036%
Credit Funds | Franklin Fund
Income Loss From Equity Method Investments [Line Items]
Other investments	10,395		10,178
Other investments % of Ownership	9.162%		9.107%
Credit Funds | Zeus
Income Loss From Equity Method Investments [Line Items]
Other investments	2,770		1,678
Other investments % of Ownership	3.386%		3.383%
Credit Funds | Apollo Lincoln Fixed Income Fund, L.P. [Member]
Income Loss From Equity Method Investments [Line Items]
Other investments	600		0
Other investments % of Ownership	0.99%		0.00%
Credit Funds | Apollo Structured Credit Recovery Master Fund III, L.P. [Member]
Income Loss From Equity Method Investments [Line Items]
Other investments	425		0
Other investments % of Ownership	2.439%		0.00%
Credit Funds | Apollo Total Return Fund L.P. [Member]
Income Loss From Equity Method Investments [Line Items]
Other investments	80		0
Other investments % of Ownership	0.08%		0.00%
Real Estate | Apollo Commercial Real Estate Finance, Inc. (“ARI”)
Income Loss From Equity Method Investments [Line Items]
Other investments	11,427	[1],[2]	11,550	[1],[2]
Other investments % of Ownership	1.499%	[1],[2]	1.50%	[1],[2]
Real Estate | AGRE U.S. Real Estate Fund, L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	9,175		9,473
Other investments % of Ownership	1.845%		1.845%
Real Estate | CPI Capital Partners North America L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	257		272
Other investments % of Ownership	0.417%		0.416%
Real Estate | CPI Capital Partners Europe
Income Loss From Equity Method Investments [Line Items]
Other investments	5		5
Other investments % of Ownership	0.001%		0.001%
Real Estate | CPI Capital Partners Asia Pacific, L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	105		106
Other investments % of Ownership	0.042%		0.042%
Real Estate | Apollo GSS Holding (Cayman), L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	3,583		3,670
Other investments % of Ownership	4.751%		3.46%
Real Estate | BEA/AGRE China Real Estate Fund, L.P.
Income Loss From Equity Method Investments [Line Items]
Other investments	70		72
Other investments % of Ownership	1.031%		1.031%
Other Equity Method Investments | Vantium A/B
Income Loss From Equity Method Investments [Line Items]
Other investments	15		15
Other investments % of Ownership	6.45%		6.45%
Other Equity Method Investments | Vantium C
Income Loss From Equity Method Investments [Line Items]
Other investments	528		1,233
Other investments % of Ownership	2.071%		2.071%
Other Equity Method Investments | Vantium D
Income Loss From Equity Method Investments [Line Items]
Other investments	$ 715		$ 2,190
Other investments % of Ownership	6.345%		6.345%

[1] Amounts are as of December 31, 2013.

[2] Investment value includes the fair value of RSUs granted to the Company as of the grant date. These amounts are not considered in the percentage of ownership until the RSUs are vested and issued to the Company, at which point the RSUs are converted to common stock and delivered to the Company.