Equity-Based Compensation - RDU Activity (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Beginning	$ 20.00
Weighted Average Grant Date Fair Value, Forfeited
Weighted Average Grant Date Fair Value, Ending
Vested Shares, Granted
Vested Shares, Forfeited
Restricted Depository Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock outstanding, beginning balance	338,430
Unvested Shares, Granted
Unvested Shares, Forfeited
Unvested Shares, Delivered
Unvested Shares, Vested
Number of restricted stock outstanding, ending balance	338,430
Weighted Average Grant Date Fair Value, Beginning	$ 8.85
Weighted Average Grant Date Fair Value, Granted
Weighted Average Grant Date Fair Value, Forfeited
Weighted Average Grant Date Fair Value, Delivered	$ 9.02
Weighted Average Grant Date Fair Value, Vested
Weighted Average Grant Date Fair Value, Ending	$ 8.85
Vested Shares, Beginning balance	114,896
Vested Shares, Granted
Vested Shares, Forfeited
Vested Shares, Delivered	(114,896)
Vested Shares, Vested
Vested Shares, Ending balance
Total Number of RDUs Outstanding, Beginning balance	453,326
Restricted Depository Units Outstanding, Granted
Restricted Depository Units Outstanding, Forfeited
Restricted Depository Units Outstanding, Delivered	(114,896)
Restricted Depository Units Outstanding, Vested
Total Number of RDUs Outstanding, Ending balance	338,430