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Internal-Use Software Development Costs Capitalized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary Of Significant Accounting Policies [Line Items]
Internal-use software development costs	$ 4,377	$ 5,717	$ 14,058	$ 13,710

The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

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