Schedule of Other Noncurrent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Other Liabilities [Line Items]
Pension and retiree medical obligations	$ 86,392	$ 91,542
Liability for uncertain tax positions	4,201	5,262
Deferred revenue	4,959	3,198
Other	14,518	15,844
Total other noncurrent liabilities	$ 110,070	$ 115,846

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement and postemployment benefit plans.

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