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Schedule of Property and Equipment by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 409,373	$ 320,282
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	347,272	287,471
All Other Countries
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 62,101	$ 32,811

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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