Commitments and Contingencies - Potential Future Reversal of Carried Interest Income (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	$ 4,038,787
Private Equity Funds VII [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	1,792,954
Private Equity Funds VI [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	1,107,522
Private Equity Funds V [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	114,215
Private Equity Funds IV [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	11,547
Private Equity Funds AAA/Other [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	108,162
Private Equity Segment [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	3,134,400
Capital Markets Funds U.S. Performing Credit [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	659,604
Capital Markets Funds Structured Credit [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	36,382
Capital Markets Funds European Credit Funds [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	52,393
Capital Markets Funds Non-Performing Loans [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	94,276
Capital Markets Funds Opportunistic Credit [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	57,169
Credit Funds [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	899,824
Real Estate Funds CPI Funds [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	4,563
Real Estate Segment [Member]
Gain Contingencies [Line Items]
Contingent obligations of potential future interest reversal of interest income	$ 4,563