Property and Equipment - Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 58,736	$ 24,876
Less: accumulated depreciation	(16,394)	(4,181)
Total property and equipment, net	42,342	20,695
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	46,541	16,586
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	4,691	1,755
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	2,649	2,795
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 4,855	$ 3,740

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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