Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 191	$ 173	$ 381	$ 346
Interest cost	228	260	457	519
Net amortization	(37)	(39)	(74)	(78)
Net periodic benefit cost	382	394	764	787
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	547	460	1,033	920
Interest cost	1,083	1,132	2,175	2,264
Expected return on plan assets	(1,186)	(1,198)	(2,397)	(2,396)
Net amortization	1,836	1,081	3,427	2,162
Net periodic benefit cost	2,280	1,475	4,238	2,950
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	336	211	678	413
Interest cost	548	595	1,105	1,169
Expected return on plan assets	(260)	(282)	(517)	(559)
Net amortization	84	113	167	223
Net periodic benefit cost	$ 708	$ 637	$ 1,433	$ 1,246