Summary of Property And Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 37,315	$ 34,538
Less accumulated depreciation	23,988	20,659
Total	13,327	13,879
Computer Equipment And Software
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	32,423	30,182
Furniture, Equipment and Building Improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 4,892	$ 4,356

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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