Property And Equipment, Net (Narrative) (Detail) (Segment, Continuing Operations [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment, Continuing Operations [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 79.8	$ 60.2	$ 44.0