Other Noncurrent Liabilities (Components of Noncurrent Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 66,672	$ 67,777
Liability for uncertain tax positions	3,045	4,624
Deferred revenue	4,763	5,578
Other	15,521	15,087
Total other noncurrent liabilities	$ 90,001	$ 93,066