Equity-Based Compensation - RDU Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value forfeited	$ 8.00
Options Outstanding, Beginning Balance	2,950,003
Options Granted	0
Options Forfeited	1,250,000
Options Outstanding, Ending Balance	1,487,503
Restricted Depository Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested outstanding, beginning balance	245,362
Unvested Shares, Granted	18,426
Unvested Shares, Forfeited	(2,861)
Unvested Shares, Delivered	0
Unvested Shares, Vested	0
Unvested outstanding, ending balance	260,927
Weighted average grant date fair value, beginning	$ 10.38
Weighted average grant date fair value granted	$ 33.05
Weighted average grant date fair value forfeited	$ 8.36
Weighted average grant date fair value delivered	$ 9.02
Weighted Average Grant Date Fair Value Vested	$ 0.00
Weighted average grant date fair value, ending	$ 12.00
Options Outstanding, Beginning Balance	120,354
Options Granted	0
Options Forfeited	0
Restricted Depository Units Outstanding Vested	(120,354)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	0
Options Outstanding, Ending Balance	0
Total Number of RDUs Outstanding, Beginning balance	365,716
Restricted Depository Units Outstanding Granted	18,426
Restricted Depository Units Outstanding Forfeited	(2,861)
Restricted Depository Units Outstanding, Delivered	(120,354)
Number Of Restricted Depository Units Outstanding	260,927