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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Oct. 31, 2012
Line of Credit
Subsequent Event [Line Items]
Payment of outstanding credit facility	$ 62.0
Acquisition of ONPATH Technologies
Subsequent Event [Line Items]
Purchase price of acquisition of ONPATH Technologies	40.0
Business acquisition, payment to employees and directors	$ 8.2

The cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity.

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