Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Domestic Plan
Net Period Benefit Cost Assumptions [Line Items]
Interest cost	$ 5,999	$ 6,631	$ 17,997	$ 19,893
Expected return on plan assets	(9,577)	(8,952)	(28,730)	(26,857)
Recognized net actuarial loss and other	2,932	2,409	8,798	7,227
Net periodic benefit cost	(646)	88	(1,935)	263
TCN Plan
Net Period Benefit Cost Assumptions [Line Items]
Interest cost	466	460	1,400	1,382
Expected return on plan assets	(651)	(610)	(1,952)	(1,832)
Recognized net actuarial loss and other	507	446	1,522	1,339
Net periodic benefit cost	$ 322	$ 296	$ 970	$ 889