Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	[2]	Sep. 30, 2015	[2]	Jun. 30, 2015	[2]	Mar. 31, 2015	[2]	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Restructuring, Settlement and Impairment Provisions	$ (5,100)		$ (7,800)		$ (5,000)		$ (1,100)		$ (3,600)		$ (9,100)		$ (1,000)		$ (700)		$ (19,061)	$ (14,407)	$ (14,481)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost																	12,895	15,562	13,529
Interest cost																	25,781	28,066	29,757
Expected return on plan assets																	(58,504)	(62,726)	(57,550)
Amortization of prior service cost (credit)																	561	1,037	1,187
Amortization of actuarial losses (gains)																	8,573	5,556	774
Special termination benefits																	2,837	0
Curtailment loss (gain)																	183	(522)	0
Net periodic benefit credit																	(7,674)	(13,027)	(12,303)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost																	222	444	535
Interest cost																	891	1,281	1,661
Expected return on plan assets																	0	0	0
Amortization of prior service cost (credit)																	(3,571)	(3,057)	(2,871)
Amortization of actuarial losses (gains)																	(599)	(348)	(328)
Special termination benefits																	0	0
Curtailment loss (gain)																	(823)	0	0
Net periodic benefit credit																	(3,880)	$ (1,680)	$ (1,003)
LaPorte, Indiana manufacturing facility [Member] | Net Curtailment Gain [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring, Settlement and Impairment Provisions																	$ 600

[1] The first, second, third and fourth quarters of 2016 include rationalization charges of $1.1 million, $5.0 million, $7.8 million and $5.1 million, respectively. The fourth quarter of 2016 includes costs attributed to announced acquisitions of $1.4 million.

[2] The first, second, third and fourth quarters of 2015 include rationalization charges of $0.7 million, $1.0 million, $9.1 million and $3.6 million, respectively.