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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

X

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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