Asset Impairment Charges and Facility Closing and Reorganization Costs - Approved Plans and Related Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,817	$ (1,400)	$ 15,103	$ (234)
Reorganization items	1,614	0	7,414	0
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,203	(1,400)	7,689	(234)
Charges incurred to date	57,500		57,500
Expected costs	6,900		6,900
Facility Closing and Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,817	$ (1,400)	$ 15,103	$ (234)