Plant, Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 78.3	$ 74.1	$ 70.7
Long Lived Assets Held-for-sale [Line Items]
Purchase Price for Pending Sale of Real Estate	41.0
Minimum [Member]
Long Lived Assets Held-for-sale [Line Items]
Estimated Gain from Pending Sale of Real Estate	38.0
Maximum [Member]
Long Lived Assets Held-for-sale [Line Items]
Estimated Gain from Pending Sale of Real Estate	$ 40.0