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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

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