Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (128,077)
Other comprehensive income before reclassifications	(19,910)
Amounts reclassified from accumulated other comprehensive income	2,104
Net current-period othre comprehensive income (loss)	(17,806)
Accumulated other comprehensive loss, ending balance	(145,883)	(128,077)
Changes in pension and post-retirement plan assets and benefit obligation, Tax benefit	88,580	89,540
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(197,806)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	2,104
Net current-period othre comprehensive income (loss)	2,104
Accumulated other comprehensive loss, ending balance	(195,702)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	69,729
Other comprehensive income before reclassifications	(19,910)
Amounts reclassified from accumulated other comprehensive income	0
Net current-period othre comprehensive income (loss)	(19,910)
Accumulated other comprehensive loss, ending balance	$ 49,819