Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost				$ 409
Interest cost	7,129	6,467	21,359	22,406
Expected return on plan assets	(8,069)	(8,177)	(22,144)	(23,278)
Recognized net actuarial loss and other	3,365	3,550	12,087	13,112
Net periodic benefit cost	2,425	1,840	11,302	12,649
TCN Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	684	505	2,055	1,728
Interest cost	594	546	1,784	1,638
Expected return on plan assets	(612)	(457)	(1,838)	(1,371)
Recognized net actuarial loss and other	688	546	2,064	1,638
Net periodic benefit cost	$ 1,354	$ 1,140	$ 4,065	$ 3,633