Shareholders Equity and Stock Options (Components of Accumulated Other Comprehensive Income or Loss) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation [Abstract]
Foreign currency translation adjustments	$ 12,585	$ 5,875
Funded status of pension plans and other postretirement benefits, net of tax of $22,371 and $20,799.	(70,158)	(67,239)
Unrealized gain (loss) on derivative instruments, net of tax of $127 and $0	(235)	(270)
Unrealized gain (loss) on marketable securities, net of tax of $0 and $1,555	0	(1,168)
Accumulated other comprehensive income (loss)	(57,808)	(62,802)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	22,371	20,799
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax	127	0
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Tax	$ 0	$ 1,555