Acquisitions - Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 JJF Enterprises and GamSys [Member]	Jun. 30, 2013 Customer relationships [Member]	Jun. 30, 2013 Existing technology [Member]	Jun. 30, 2013 Trade name [Member]	Jun. 30, 2013 IPR&D [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life				5 years	3 years	3 years	3 years
Purchase Price Allocation, intangible assets	$ 72,333	$ 80,244		$ 2,130	$ 650	$ 280	$ 150
Purchase Price Allocation, Goodwill	222,398	219,383	6,245
Purchase Price Allocation	9,455
Net tangible liabilities	(1,230)
Total purchase price	$ 8,225