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Purchase Price Allocation Based on Fair Value of Assets Acquired and Liabilities Assumed, Accounting Plaza (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 25, 2012
Accounting Plaza B.V. ("Accounting Plaza")
Business Acquisition [Line Items]        
Purchase consideration       $ 38,698
Acquisition related costs included in selling, general and administrative expenses       434
Recognized amounts of identifiable assets acquired and liabilities assumed        
Cash and cash equivalents       1,664
Current assets       11,327
Tangible fixed assets       2,010
Intangible assets       13,138
Deferred tax asset/ (liability), net       (2,711)
Other non-current assets       971
Current liabilities       (9,062)
Other liabilities       (4,188)
Total identifiable net assets acquired       13,149
Goodwill 950,424 956,064 925,339 25,549
Total       $ 38,698