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Acquisitions - Consideration (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Business Combination [Abstract]    
Cash (including debt repaid at closing) $ 857,219 $ 602,297
Repayment of the preferred equity interest and mezzanine loan 160,123 0
Fair value of previously held equity interests 46,339 43,208
Total consideration $ 1,063,681 $ 645,505