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Acquisitions - Consideration (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]    
Cash (including debt repaid at closing) $ 596,008 $ 143,063
Fair value of previously held equity interests 43,208 14,959
Total consideration $ 639,216 $ 158,022