Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Compensation [Abstract]

Activity associated with limited partnership units

	Number of Units
Balance at December 31, 2011		45,814,354
Granted		31,646,404
Redeemed/Exchanged units		(12,052,194	)
Forfeited units		(806,662	)
Balance at September 30, 2012		64,601,902

Activity associated with restricted stock units

	Restricted Stock Units			Weighted- Average Grant Date Fair Value		Weighted- Average Remaining Contractual Term (Years)
Balance at December 31, 2011		2,721,820		$	5.96		1.76
Granted		1,498,396			5.48
Delivered units		(1,381,639	)		4.93
Forfeited units		(197,218	)		5.64
Balance at September 30, 2012		2,641,359		$	6.25		1.95

Activity associated with stock options

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Balance at December 31, 2011		8,256,066		$	14.07		2.9	$	—
Forfeited options		(148,197	)		9.18
Balance at September 30, 2012		8,107,869		$	14.16		2.2	$	—
Options exercisable at September 30, 2012		8,107,869		$	14.16		2.2	$	—