Summary of Changes in Financial Assets Measured at Fair Value for Which Level III Inputs Were Used (Detail) (Level 3, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	$ 3,076,466		$ 2,132,488
Transfer In Due to Consolidation and Acquisition	684,991	[1]	246,022	[1]
Transfer Out Due to Deconsolidation	(284,960)		(1,599)
Transfer In to Level III	637,077	[2]	687,225	[2]
Transfer Out of Level III	(490,878)	[2]	(150,097)	[2]
Purchases	1,232,986		956,646
Sales	(1,628,100)		(964,363)
Settlements	354		(46)
Realized Gains (Losses), Net	78,658		(17,060)
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	248,544		187,250
Balance, End of Period	3,555,138		3,076,466
Investments Of Consolidated Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	3,017,699		2,103,769
Transfer In Due to Consolidation and Acquisition	673,031	[1]	246,022	[1]
Transfer Out Due to Deconsolidation	(284,960)		(1,599)
Transfer In to Level III	624,450	[2]	687,225	[2]
Transfer Out of Level III	(481,637)	[2]	(150,097)	[2]
Purchases	733,356		772,305
Sales	(1,249,271)		(809,367)
Realized Gains (Losses), Net	64,681		(17,201)
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	261,403		186,642
Balance, End of Period	3,358,752		3,017,699
Loans And Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	30,663		8,555
Purchases	370,508		176,641
Sales	(265,996)		(154,293)
Settlements	2,312		(46)
Realized Gains (Losses), Net	43		(308)
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	258		114
Balance, End of Period	137,788		30,663
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	28,104	[3]	20,164	[3]
Transfer In Due to Consolidation and Acquisition	11,960	[1],[3]
Transfer In to Level III	12,627	[2],[3]
Transfer Out of Level III	(9,241)	[2],[3]
Purchases	129,122	[3]	7,700	[3]
Sales	(112,833)	[3]	(703)	[3]
Settlements	(1,958)	[3]
Realized Gains (Losses), Net	13,934	[3]	449	[3]
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	(13,117)	[3]	494	[3]
Balance, End of Period	$ 58,598	[3]	$ 28,104	[3]

[1] Represents the transfer into Level III of financial assets and liabilities as a result of the consolidation of certain fund entities, the acquisition of management contracts and the Harbourmaster acquisition.

[2] Transfers in and out of Level III financial assets and liabilities were due to changes in the observability of inputs used in the valuation of such assets and liabilities.

[3] Represents Blackstone's Treasury Cash Management Strategies and Other Investments.