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Internal-Use Software Development Costs Capitalized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Internal-use software development costs	$ 1,170	$ 4,696

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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