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Information with Respect to Ordinary Shares that were Surrendered or Repurchased (Detail) - $ / shares
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Equity, Class of Treasury Stock [Line Items]    
Total Number of Shares Purchased 596 0
Average Price Paid Per Share $ 27.01  
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program 0  
May 1-31, 2015    
Equity, Class of Treasury Stock [Line Items]    
Total Number of Shares Purchased [1],[2] 596  
Average Price Paid Per Share [1] $ 27.01  
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1] 0  
[1] Based on settlement date.
[2] Surrendered by employees as payment of taxes withheld on the vesting of restricted A ordinary shares.