Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost	$ 9,046	$ 7,208	$ 19,070	$ 13,671
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,044	3,503	6,217	6,435
Interest cost	7,982	8,385	16,195	16,461
Expected return on assets	(11,649)	(12,167)	(23,279)	(24,286)
Amortization of prior service benefit	(225)	(231)	(486)	(476)
Amortization of net loss	8,996	6,614	18,100	13,107
Total net periodic benefit cost	8,148	6,104	16,747	11,241
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	87	7	137	132
Interest cost	736	852	1,586	1,697
Expected return on assets	(119)	(144)	(244)	(255)
Amortization of prior service benefit	(23)	(250)	(48)	(349)
Amortization of net loss	217	639	892	1,205
Total net periodic benefit cost	$ 898	$ 1,104	$ 2,323	$ 2,430