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Copal Partners, Total Consideration Transferred to Sellers (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Nov. 04, 2011
Copal Partners
Dec. 11, 2013
Amba
Business Acquisition [Line Items]        
Cash paid     $ 125.0 $ 67.2
Put/call option for non-controlling interest     (68.0)  
Contingent consideration arising from acquisitions, liabilities (17.5) (9.0) 6.8 4.3
Total fair value of consideration transferred     $ 199.8 $ 71.6