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Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Assets, Current [Line Items]
Deposits in trusts for employee benefits and retirement plans	$ 129,244	$ 97,535
Other	70,081	63,670
Other current assets	$ 199,325	$ 161,205

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate within one year of the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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