EQUITY-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2013

Equity-based compensation

Schedule of ranges of significant assumptions used to develop the fair value estimates of equity-based awards

		Range for the Year Ended December 31,
Valuation Methodology	Significant Assumption	2013			2012			2011
Income approach	Discount rate		14% - 17	%		18% - 20	%		20% - 22	%
Market approach	Forward income multiples		13.0 - 20.0			11.0 - 17.0			9.0 - 17.5
	Forward revenue multiples		1.5 - 3.25			N/A			N/A

Management Units

Equity-based compensation

Schedule of activity related to the Management Units provided to partner and non-partner employees

	Units			Weighted average fair value at grant date
Outstanding at January 1, 2011		745,152		$	115.29
Granted		75,569			824.89
Forfeited		(19,329	)		143.57
Outstanding at December 31, 2011		801,392			181.59
Granted		61,837			1,133.71
Forfeited		(8,226	)		1,003.46
Outstanding at December 31, 2012		855,003			242.55
Granted		38,162			1,005.21
Forfeited		(11,085	)		689.21
Outstanding at December 31, 2013		882,080			270.05

Schedule of activity related to the unvested Management Units provided to partner and non-partner employees

	Units			Weighted average fair value at grant date
Unvested Balance at January 1, 2013		554,522		$	366.26
Granted		38,162			1,005.21
Forfeited		(11,085	)		689.21
Vested		(128,642	)		113.38
Unvested Balance at December 31, 2013		452,957			485.44

Parent Company Investment | Management Units provided upon joining

Equity-based compensation

Summary of vesting schedule

Years 1 through 4	0	%
End of year 5	50	%
End of year 6	662/3	%
End of year 7	831/3	%
End of year 8	100	%

Parent Company Investment | Management Units granted as part of certain partner's incentive arrangements upon joining | Partners

Equity-based compensation

Summary of vesting schedule

Years 1 and 2	0	%
End of year 3	331/3	%
End of year 4	662/3	%
End of year 5	100	%