Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Domestic Plan
Net Period Benefit Cost Assumptions [Line Items]
Service cost			$ 543
Interest cost	26,522	28,454	30,639
Expected return on plan assets	(35,811)	(30,216)	(30,830)
Amortization of net loss	9,725	15,842	18,071
Amortization of prior service cost (credit)			(268)
Recognized (gain) loss due to curtailments and other adjustments	(91)	(24)	(1,185)
Net periodic benefit cost	345	14,056	16,970
Increase (decrease) in accumulated other comprehensive loss due to actuarial losses-before taxes	19,580	(37,973)	16,492
Net periodic benefit cost	19,580	(37,973)	16,492
TCN Plan
Net Period Benefit Cost Assumptions [Line Items]
Service cost		2,740	2,305
Interest cost	1,843	2,379	2,185
Expected return on plan assets	(2,443)	(2,450)	(1,829)
Amortization of net loss	1,785	2,736	2,167
Amortization of prior service cost (credit)		16	16
Recognized (gain) loss due to curtailments and other adjustments		15
Net periodic benefit cost	1,185	5,436	4,844
Increase (decrease) in accumulated other comprehensive loss due to actuarial losses-before taxes	3,998	10,008	5,120
Decrease in accumulated other comprehensive loss due to curtailment gain		(17,267)
Net periodic benefit cost	$ 3,998	$ (7,259)	$ 5,120