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Changes in Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Opening balance $ 956,064 $ 925,339
Goodwill relating to acquisitions consummated during the period 37,918 43,265
Adjustment to preliminary purchase accounting for acquisitions (362) (3,213)
Effect of exchange rate fluctuations (43,196) (9,327)
Closing balance $ 950,424 $ 956,064