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Purchase Price Allocation Based on Fair Value of Assets Acquired and Liabilities Assumed, Atyati Technologies Private Limited (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 04, 2012
Atyati Technologies Private Limited
Business Acquisition [Line Items]        
Purchase price       $ 23,394
Acquisition related costs included in selling, general and administrative expenses       164
Recognized amounts of identifiable assets acquired and liabilities assumed        
Cash and cash equivalents       2,000
Current assets       5,265
Tangible fixed assets       426
Intangible assets       8,767
Deferred tax asset/ (liability), net       (2,557)
Other non-current assets       369
Current liabilities       (3,424)
Short term borrowings       (654)
Other liabilities       (737)
Total identifiable net assets acquired       9,455
Goodwill 950,424 956,064 925,339 13,939
Total       $ 23,394