Equity-Based Compensation (Details) (Parent)	3 Months Ended
	Mar. 31, 2014
Equity-based compensation
Number of units outstanding	1,099,502
Management Units
Equity-based compensation
Number of units outstanding	880,794
Management Units provided upon joining
Equity-based compensation
Vesting period	8 years
Management Units provided upon joining | Years 1 through 4
Equity-based compensation
Vesting rights (as a percent)	0.00%
Management Units provided upon joining | End of year 5
Equity-based compensation
Vesting rights (as a percent)	50.00%
Management Units provided upon joining | End of year 6
Equity-based compensation
Vesting rights (as a percent)	66.67%
Management Units provided upon joining | End of year 7
Equity-based compensation
Vesting rights (as a percent)	83.33%
Management Units provided upon joining | End of year 8
Equity-based compensation
Vesting rights (as a percent)	100.00%
Management Units are granted as part of certain partner's incentive arrangements upon joining | Partners
Equity-based compensation
Vesting period	5 years
Management Units are granted as part of certain partner's incentive arrangements upon joining | Non-partner employees
Equity-based compensation
Vesting period	4 years
Management Units are granted as part of certain partner's incentive arrangements upon joining | Years 1 and 2 | Partners
Equity-based compensation
Vesting rights (as a percent)	0.00%
Management Units are granted as part of certain partner's incentive arrangements upon joining | End of year 3 | Partners
Equity-based compensation
Vesting rights (as a percent)	33.33%
Management Units are granted as part of certain partner's incentive arrangements upon joining | End of year 4 | Partners
Equity-based compensation
Vesting rights (as a percent)	66.67%
Management Units are granted as part of certain partner's incentive arrangements upon joining | End of year 5 | Partners
Equity-based compensation
Vesting rights (as a percent)	100.00%