Components of Noncurrent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 94,216	$ 96,853
Liability for uncertain tax positions	4,723	4,989
Deferred revenue	5,948	6,534
Contingent consideration for acquisition	0	5,515
Other	14,879	14,484
Total other noncurrent liabilities	$ 119,766	$ 128,375