Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 6,569	$ 7,155	$ 13,262	$ 14,230
Expected return on plan assets	(8,905)	(7,550)	(17,905)	(14,075)
Recognized net actuarial loss	2,228	4,482	4,818	8,730
Curtailments		(8)		(8)
Net periodic benefit cost	(108)	4,079	175	8,877
TCN Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		686		1,371
Interest cost	461	595	922	1,190
Expected return on plan assets	(611)	(613)	(1,222)	(1,226)
Amortization of prior service cost		4		8
Recognized net actuarial loss	447	684	893	1,368
Net periodic benefit cost	$ 297	$ 1,356	$ 593	$ 2,711