Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Domestic Plan
Net Period Benefit Cost Assumptions [Line Items]
Interest cost	$ 11,831	$ 6,569	$ 11,998	$ 13,262
Expected return on plan assets	(16,153)	(8,905)	(19,153)	(17,905)
Recognized net actuarial loss and other	2,714	2,228	5,866	4,818
Net periodic benefit cost	(1,608)	(108)	(1,289)	175
TCN Plan
Net Period Benefit Cost Assumptions [Line Items]
Interest cost	467	461	934	922
Expected return on plan assets	(650)	(611)	(1,301)	(1,222)
Recognized net actuarial loss and other	508	447	1,015	893
Net periodic benefit cost	$ 325	$ 297	$ 648	$ 593