Segment Reporting - Additional Financial Data for Apollo's Reportable Segments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Apollo Special Opportunities Managed Account, L.P. ("SOMA") [Member]	Jun. 30, 2012 Private Equity Funds VI [Member]	Jun. 30, 2012 Private Equity Funds VI [Member]	Jun. 30, 2012 Apollo Special Opportunities Managed Accounts [Member]	Jun. 30, 2012 Apollo Special Opportunities Managed Accounts [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General partner obligation to return previously distributed carried interest income	$ 19.3	$ 102.6	$ 68.5	$ 18.3	$ 0.2