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Acquisitions and Revaluations of Non-Controlling Interests - Changes in Carrying Amount of Redeemable Non-Controlling Interest (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Business Acquisition [Line Items]  
Beginning balance $ 4,104
Increase due to revaluation of redeemable non-controlling interests 1,639
Purchases of redeemable non-controlling interests (2,776)
Ending balance $ 2,967