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Amount of Stock-Based Compensation, Net of Estimated Forfeitures, Included in Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation	$ 3,983	$ 4,631	$ 5,613
Direct costs of customer support
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation	659	755	974
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation	835	944	1,395
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation	$ 2,489	$ 2,932	$ 3,244

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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