Equity-Based Compensation - Summary of Company's RSUs and Stock Options (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	6.4
Granted at fair market value, Number of Shares
Vesting of restricted share units, Number of Shares	8.5
Forfeited/cancelled, Number of Shares
Net share settlement, Number of Shares	(3.7)
Ending Balance, Number of Shares	11.2
Beginning Balance, Weighted Average Grant Date Fair Value	$ 0.74
Granted at fair market value, Weighted Average Grant Date Fair Value
Vesting of restricted share units, Weighted Average Grant Date Fair Value	$ 0.44
Forfeited/cancelled, Weighted Average Grant Date Fair Value
Net share settlement, Weighted Average Grant Date Fair Value	$ 0.45
Ending Balance, Weighted Average Grant Date Fair Value	$ 0.61
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Options	2.0
Granted at fair market value, Number of Options	2.0
Vesting of restricted share units, Number of Options
Forfeited/cancelled, Number of Options
Net share settlement, Number of Options
Ending Balance, Number of Options	4.0
Beginning Balance, Weighted Average Grant Date Fair Value	$ 0.12
Granted at fair market value, Weighted Average Grant Date Fair Value	$ 1.09
Vesting of restricted share units, Weighted Average Grant Date Fair Value
Forfeited/cancelled, Weighted Average Grant Date Fair Value
Net share settlement, Weighted Average Grant Date Fair Value
Ending Balance, Weighted Average Grant Date Fair Value	$ 0.61
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	41.8
Granted at fair market value, Number of Shares	23.9
Vesting of restricted share units, Number of Shares	8.5
Forfeited/cancelled, Number of Shares	(3.6)
Net share settlement, Number of Shares
Ending Balance, Number of Shares	53.6
Beginning Balance, Weighted Average Grant Date Fair Value	$ 0.39
Granted at fair market value, Weighted Average Grant Date Fair Value	$ 1.56
Vesting of restricted share units, Weighted Average Grant Date Fair Value	$ 0.44
Forfeited/cancelled, Weighted Average Grant Date Fair Value	$ 0.40
Net share settlement, Weighted Average Grant Date Fair Value
Ending Balance, Weighted Average Grant Date Fair Value	$ 0.90