Equity-Based Compensation - RSU Activity (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested Shares, Granted
Vested Shares, Forfeited
Weighted Average Grant Date Fair Value, Beginning		$ 20.00
Weighted Average Grant Date Fair Value, Forfeited
Weighted Average Grant Date Fair Value, Ending
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested Shares, Beginning balance		14,724,474
Vested Shares, Granted		443,632
Vested Shares, Forfeited		(569,664)
Vested Shares, Delivered
Weighted average grant date fair value unvested, vested		(3,361,655)
Vested Shares, Ending balance	11,236,787	11,236,787
Weighted Average Grant Date Fair Value, Beginning		$ 11.62
Weighted Average Grant Date Fair Value, Granted		$ 20.35
Weighted Average Grant Date Fair Value, Forfeited		$ 13.71
Weighted Average Grant Date Fair Value, Delivered		$ 13.00
Weighted Average Grant Date Fair Value, Vested		$ 11.65
Weighted Average Grant Date Fair Value, Ending	$ 11.85	$ 11.85
Number of restricted stock outstanding, beginning balance		22,512,930
Unvested Shares, Granted	239,062
Unvested Shares, Forfeited
Unvested Shares, Delivered		(3,356,149)
Unvested Shares, Vested		3,361,655
Number of restricted stock outstanding, ending balance	22,518,436	22,518,436
Total Number of RSUs Outstanding, Beginning		37,237,404
Number of RSUs Outstanding, Granted		443,632
Number of RSUs Outstanding, Forfeited		(569,664)
Number of RSUs Outstanding, Delivered		(3,356,149)
Number of RSUs Outstanding, Vested
Total Number of RSUs Outstanding, Ending	33,755,223	33,755,223