Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) to Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	$ 127,600		$ 191,400
Tax (provision) benefit	(36,900)		(52,700)
Net of tax	90,700		138,700
Reclassification out of Accumulated Other Comprehensive Income
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	(2,600)		(1,100)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	(700)	[1]	800	[1]
Tax (provision) benefit	300	[1]	(200)	[1]
Net of tax	(400)	[1]	600	[1]
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	(3,400)	[2]	(2,500)	[2]
Tax (provision) benefit	1,200	[2]	800	[2]
Net of tax	$ (2,200)	[2]	$ (1,700)	[2]

[1] See Note 5 of the notes to the condensed consolidated financial statements.

[2] These components are included in the computation of net periodic pension cost. See Note 9 to the condensed consolidated financial statements.