Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Total net periodic pension and postretirement benefit cost	$ 9,657	$ 6,880	$ 28,727	$ 20,551
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,174	3,242	9,391	9,677
Interest cost	8,076	8,252	24,271	24,713
Expected return on assets	(11,634)	(12,152)	(34,913)	(36,438)
Amortization of prior service benefit	(245)	(238)	(731)	(714)
Amortization of net loss	9,124	6,562	27,224	19,669
Total net periodic pension and postretirement benefit cost	8,495	5,666	25,242	16,907
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	69	65	206	197
Interest cost	793	848	2,379	2,545
Expected return on assets	(122)	(127)	(366)	(382)
Amortization of prior service benefit	(24)	(174)	(72)	(523)
Amortization of net loss	446	602	1,338	1,807
Total net periodic pension and postretirement benefit cost	$ 1,162	$ 1,214	$ 3,485	$ 3,644