Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost	$ 1,570	$ (10,446)		$ 3,152	$ (10,203)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,332	3,044		6,974	6,217
Interest cost	7,715	7,982		14,933	16,193
Expected return on assets	(9,821)	(11,649)		(19,693)	(23,279)
Actuarial gain		(5,840)	[1]		(5,840)	[1]
Amortization of prior service benefit	(295)	(225)		(344)	(486)
Total net periodic benefit cost	931	(6,688)		1,870	(7,195)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	71	87		154	137
Interest cost	694	736		1,382	1,586
Expected return on assets	(103)	(119)		(206)	(244)
Actuarial gain		(4,439)	[1]		(4,439)	[1]
Amortization of prior service benefit	(23)	(23)		(48)	(48)
Total net periodic benefit cost	$ 639	$ (3,758)		$ 1,282	$ (3,008)

[1] In the second quarter of 2013, we identified that our consolidated statements of income for the three-month and six-month periods ended June 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.