Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,756	$ 1,759	$ 1,665
Interest cost	4,247	4,506	4,525
Expected return on plan assets	(4,687)	(4,755)	(4,396)
Net amortization	5,376	4,855	4,401
Net periodic benefit cost	6,692	6,365	6,195
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,300	1,078	719
Interest cost	2,206	2,320	2,148
Expected return on plan assets	(1,035)	(1,117)	(945)
Net amortization	589	442	302
Net periodic benefit cost	3,060	2,723	2,224
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	763	691	528
Interest cost	922	1,035	1,008
Net amortization	11	(156)	(370)
Net periodic benefit cost	$ 1,696	$ 1,570	$ 1,166