Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 444,674	$ 364,352
Less: accumulated depreciation and amortization ($6,353 and $3,267 related to capital leases at December 31, 2011 and 2010, respectively)	(246,305)	(222,063)
Property and equipment, net	198,369	142,289
Network equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	121,705	113,593
Network equipment under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,417	1,426
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	24,508	13,002
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,625	25,748
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	231,391	191,915
Buildings under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 36,028	$ 18,668

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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