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Long Term Retention Plan - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Quotas
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of quotas for payment under LTRP 6
Percentage quotas in each installment under LTRP 16.67%
Percentage base for calculation of quotas under LTRP 8.333%
Long Term Retention Plan each quota calculation term 8.333% is adjusted by multiplying the nominal amount by the average closing stock price for the last 60 trading days of the year previous to the payment date and divided by the average closing stock price for the last 60 trading days of 2013. The average closing stock price for the 2014 LTRP amounted to $118.48 ("the variable share").
Number of trading days consider for average closing price 60 days
Average closing stock price $ 118.48
Long Term Retention Plan 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Long Term Retention Plan payment term In 6 equal annual quotas (16.67% each) commencing on March 31, 2015