Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 76,544	$ 75,481
Less accumulated depreciation and amortization	(51,597)	(50,704)
Property and equipment, net	24,947	24,777
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,005	10,877
Software and development costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	56,369	54,274
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,291	3,291
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,879	$ 7,039

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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