Property, Plant and Equipment - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Depreciation expense	$ 33.3	$ 35.7
Building and related land sales, deposit received	$ 32.1		$ 12.5