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Acquisition of Cronto - Additional Information (Detail) (Cronto [Member]) In Thousands, unless otherwise specified						6 Months Ended
	Jun. 30, 2013 USD ($)	Jun. 30, 2013 EUR (€)	Jun. 30, 2013 GBP (£)	May 20, 2013 USD ($)	May 20, 2013 EUR (€)	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]
Loans At Acquisition Date [Line Items]
Percentage of stock acquired by the company				100.00%	100.00%
Initial consideration				$ 19,611	€ 15,000
Exchange rate	1.55	1.55	1.55	1.31	1.31
Additional consideration	555		358
Contingent consideration	2,620	2,000
Acquired identifiable intangible assets	$ 13,244
Estimated Useful lives of asset						2 years	5 years

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The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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