Pensions And Other Employee Benefits Plans (Components Of Net Periodic Cost) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service credits			$ 508	$ 122
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,640	3,048	10,919	9,144
Interest cost	6,366	6,327	19,098	18,981
Expected return on plan assets	(6,243)	(5,813)	(18,729)	(17,439)
Amortization of net actuarial loss or (gain)	2,967	1,390	8,902	4,170
Amortization of prior service credits	(679)	(679)	(2,038)	(2,037)
Net periodic cost	6,051	4,273	18,152	12,819
Net periodic cost included in income from discontinued operations	(5,420)	(3,759)	(16,259)	(11,276)
Net periodic cost included in income from continuing operations	631	514	1,893	1,543
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	152	181	456	543
Interest cost	763	837	2,289	2,511
Expected return on plan assets		(4)		(12)
Amortization of net actuarial loss or (gain)	(94)	(197)	(282)	(591)
Amortization of prior service credits	(182)	(182)	(546)	(546)
Net periodic cost	639	635	1,917	1,905
Net periodic cost included in income from discontinued operations	(630)	(643)	(1,890)	(1,929)
Net periodic cost included in income from continuing operations	$ 9	$ (8)	$ 27	$ (24)