Property and Equipment, Net (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation	$ 10.5	$ 7.8	$ 0.3
Loss From Discontinued Operations, Net of Taxes
Property, Plant and Equipment [Line Items]
Write-off of property and equipment from discontinued operations	$ 0.1	$ 0.1