Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost	$ 1,582	$ 243
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,642	3,173
Interest cost	7,218	8,211
Expected return on assets	(9,872)	(11,630)
Amortization of prior service benefit	(49)	(261)
Total net periodic benefit cost	939	(507)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	83	50
Interest cost	688	850
Expected return on assets	(103)	(125)
Amortization of prior service benefit	(25)	(25)
Total net periodic benefit cost	$ 643	$ 750