Summary of Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 50,706	$ 24,876	$ 11,570	$ 2,348
Less: accumulated depreciation	(11,620)	(4,181)	(2,103)	(650)
Total property and equipment, net	39,086	20,695	9,467	1,698
Computer Equipment And Software
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	41,919	16,586	6,562	1,752
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	3,017	1,755	1,230	192
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	815	2,795	2,747	106
Construction in Progress
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 4,955	$ 3,740	$ 1,031	$ 298

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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