Pension Plans and Other Postretirement Benefits - Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Total net periodic pension benefit cost (credit)	$ 1,578		$ 86		$ 4,730		$ (10,117)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,488		3,174		10,462		9,391
Interest cost	7,470		8,076		22,403		24,269
Expected return on assets	(9,848)		(11,634)		(29,541)		(34,913)
Actuarial gain	0	[1]	0	[1]	0	[1]	(5,840)	[1]
Amortization of prior service benefit	(173)		(245)		(517)		(731)
Total net periodic pension benefit cost (credit)	937		(629)		2,807		(7,824)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	78		69		232		206
Interest cost	691		793		2,073		2,379
Expected return on assets	(104)		(122)		(310)		(366)
Actuarial gain	0	[1]	0	[1]	0	[1]	(4,439)	[1]
Amortization of prior service benefit	(24)		(25)		(72)		(73)
Total net periodic pension benefit cost (credit)	$ 641		$ 715		$ 1,923		$ (2,293)

[1] In the second quarter of 2013, we identified that our consolidated statement of income for the nine-month period ended September 30, 2012 included a correction of $10.3 million for pension and OPEB plan actuarial gains that related to 2011. This amount was deemed to be not material with respect to our financial statements for the year ended December 31, 2012 and any prior period financial statements.