Other Comprehensive Loss as Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Domestic Plan
Pension cost in accumulated other comprehensive loss:
Net actuarial loss	$ (76,038)	$ (129,830)
TCN Plan
Pension cost in accumulated other comprehensive loss:
Net actuarial loss	(4,525)	(14,505)
Prior service cost (credit)		(31)
Current year | Domestic Plan
Pension cost in accumulated other comprehensive loss:
Net actuarial loss	16,913
Pension cost in accumulated other comprehensive loss	16,913
Current year | TCN Plan
Pension cost in accumulated other comprehensive loss:
Net actuarial loss	2,736
Prior service cost (credit)	16
Pension cost in accumulated other comprehensive loss	2,752
One Year from Balance Sheet Date | Domestic Plan
Pension cost in accumulated other comprehensive loss:
Net actuarial loss	9,922
Pension cost in accumulated other comprehensive loss	9,922
One Year from Balance Sheet Date | TCN Plan
Pension cost in accumulated other comprehensive loss:
Net actuarial loss	1,785
Pension cost in accumulated other comprehensive loss	$ 1,785