Net Periodic Benefit Cost (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
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 6,631	$ 7,129	$ 19,893	$ 21,359
Expected return on plan assets	(8,952)	(8,069)	(26,857)	(22,144)
Recognized net actuarial loss and other	2,409	3,365	7,227	12,087
Net periodic benefit cost	88	2,425	263	11,302
TCN Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		684		2,055
Interest cost	460	594	1,382	1,784
Expected return on plan assets	(610)	(612)	(1,832)	(1,838)
Recognized net actuarial loss and other	446	688	1,339	2,064
Net periodic benefit cost	$ 296	$ 1,354	$ 889	$ 4,065