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Reconciliation of Reportable Segment's Assets to Total Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 1,738,595	$ 2,057,998
Careers - China
Segment Reporting Information [Line Items]
Assets	$ 80,303

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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