Amounts Recognized in Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Payroll and benefit-related liabilities	$ (74,586)	$ (64,386)
Pension and postretirement benefit liabilities	(170,946)	(194,984)
Pension
Defined Benefit Plan Disclosure [Line Items]
Payroll and benefit-related liabilities	(1,784)	(1,813)
Pension and postretirement benefit liabilities	(118,537)	(148,657)
Accumulated other comprehensive loss	186,916	204,508
Amounts recognized in balance sheet	66,595	54,038
Other Benefit
Defined Benefit Plan Disclosure [Line Items]
Payroll and benefit-related liabilities	(3,200)	(3,181)
Pension and postretirement benefit liabilities	(52,409)	(46,327)
Accumulated other comprehensive loss	12,254	6,854
Amounts recognized in balance sheet	$ (43,355)	$ (42,654)