Other Noncurrent Liabilities (Components of Noncurrent Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 64,092	$ 67,777
Liability for uncertain tax positions	3,325	4,624
Deferred revenue	5,047	5,578
Other	15,781	15,087
Total other noncurrent liabilities	$ 88,245	$ 93,066