Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Domestic Plan
Net Period Benefit Cost Assumptions [Line Items]
Interest cost	$ 167	$ 6,693
Expected return on plan assets	(3,000)	(9,000)
Recognized net actuarial loss and other	3,152	2,590
Net periodic benefit cost	319	283
TCN Plan
Net Period Benefit Cost Assumptions [Line Items]
Interest cost	467	461
Expected return on plan assets	(651)	(611)
Recognized net actuarial loss and other	507	446
Net periodic benefit cost	$ 323	$ 296