Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 6,693	$ 7,075
Expected return on plan assets	(9,000)	(6,525)
Recognized net actuarial loss and other	2,590	4,248
Net periodic benefit cost	283	4,798
TCN Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		685
Interest cost	461	595
Expected return on plan assets	(611)	(613)
Amortization of prior service cost		4
Recognized net actuarial loss and other	446	684
Net periodic benefit cost	$ 296	$ 1,355