Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]  
Payment for deposit on acquisition $ 14.4