Asset Impairment Charges and Facility Closing and Reorganization Costs - Approved Plans and Related Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Facility closing and reorganization costs, net	$ 24,913	$ 8,719	$ 19,844
Closure of facilities
Restructuring Cost and Reserve [Line Items]
Closure of facilities	12,703	8,719	19,844
Charges incurred to date	62,300
Expected costs	9,400
Organization effectiveness
Restructuring Cost and Reserve [Line Items]
Organizational effectiveness	$ 12,210	$ 0	$ 0