Disclosure of accumulated other comprehensive income (loss) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Foreign currency translation adjustment	$ (33,206)	$ (31,277)
Pension and postretirement benefit plans	(335,968)	(348,306)
Tax effect	117,647	122,460
Net of tax amount	(218,321)	(225,846)
Unrealized holding gains on securities available-for-sale	28,500	172,969
Tax effect	(4,510)	(18,401)
Net of tax amount	23,990	154,568
Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Pretax	2,139	(447)
Tax effect	(641)	134
Net of tax amount	1,498	(313)
Accumulated other comprehensive income (loss)	$ (226,039)	$ (102,868)