XML 46 R75.htm IDEA: XBRL DOCUMENT v2.4.0.6
Plant, Property and Equipment, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Recognized depreciation expense $ 54.6 $ 56.4 $ 51.6