Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 180		$ 348
Interest cost	7,155	10,142	14,230	19,643
Expected return on plan assets	(7,550)	(10,205)	(14,075)	(19,765)
Recognized net actuarial loss and other	4,482	5,500	8,730	10,653
Curtailments	(8)		(8)
Net periodic benefit cost	4,079	5,617	8,877	10,879
Third Country National Employees Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	686	576	1,371	1,152
Interest cost	595	546	1,190	1,092
Expected return on plan assets	(613)	(457)	(1,226)	(914)
Amortization of prior service cost	4	546	8	1,092
Recognized net actuarial loss and other	684		1,368
Net periodic benefit cost	$ 1,356	$ 1,211	$ 2,711	$ 2,422