Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 43,870	$ 29,582
Less: accumulated depreciation and amortization	(13,043)	(15,124)
Property and equipment, net	30,827	14,458
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,065	12,778
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,715	8,951
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,160	3,495
Computer software purchased
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,048	3,186
Computer software developed for internal use
Property, Plant and Equipment [Line Items]
Property and equipment, gross	721	721
Fixed assets in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 161	$ 451

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 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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- Definition

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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