Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income or Loss (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments	$ 6,407	$ 5,875
Funded status of pension plans and other postretirement benefits, net of tax	(65,216)	(67,239)
Unrealized gain (loss) on derivative instruments, net of tax	(355)	(270)
Unrealized gain (loss) on marketable securities, net of tax	0	(1,168)
Accumulated other comprehensive income (loss)	(59,164)	(62,802)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	20,799	20,799
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax	0	0
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Tax	$ 0	$ 1,555