Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 239	$ 399	$ 1,272	$ 1,319
Interest cost	876	1,116	3,051	3,380
Expected return on plan assets	(964)	(1,171)	(3,361)	(3,567)
Net amortization	817	1,261	4,244	3,423
Net periodic benefit cost	968	1,605	5,206	4,555
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	328	207	1,006	620
Interest cost	527	587	1,632	1,756
Expected return on plan assets	(256)	(278)	(773)	(837)
Net amortization	77	111	244	334
Net periodic benefit cost	676	627	2,109	1,873
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	191	173	572	519
Interest cost	230	259	687	778
Net amortization	(37)	(39)	(111)	(117)
Net periodic benefit cost	$ 384	$ 393	$ 1,148	$ 1,180