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Amba, Total Consideration Transferred to Sellers (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 11, 2013
Amba
Business Acquisition [Line Items]      
Cash paid     $ 67.2
Contingent consideration arising from acquisitions, liabilities (17.5) (9.0) 4.3
Additional purchase price on working capital     (0.1)
Total fair value of consideration transferred     $ 71.6