Other Noncurrent Liabilities - Components of Noncurrent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 67,731	$ 67,777
Liability for uncertain tax positions	3,017	4,624
Deferred revenue	5,184	5,578
Other	15,416	15,087
Total other noncurrent liabilities	$ 91,348	$ 93,066