Property, Plant and Equipment - Additional Information (Detail) (Property Plant and Equipment, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Depreciation of property, plant and equipment	$ 41.5	$ 33.4	$ 81.2	$ 66.0