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Internal-Use Software Development Costs Capitalized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary Of Significant Accounting Policies [Line Items]
Internal-use software development costs	$ 4,984	$ 4,735	$ 9,681	$ 7,993

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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