Goodwill and Intangible Assets - Intangible Assets as a Direct Result from the Cadent Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of December 31, 2012	$ 53,325	$ 53,200
Accumulated Amortization	(7,548)	(3,178)
Total	45,777	50,022
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of December 31, 2012	7,100	7,100
Accumulated Amortization	(895)	(404)
Total	6,205	6,696
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of December 31, 2012	12,600	12,600
Accumulated Amortization	(1,642)	(735)
Total	10,958	11,865
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of December 31, 2012	33,500	33,500
Accumulated Amortization	(5,002)	(2,039)
Total	28,498	31,461
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of December 31, 2012	125
Accumulated Amortization	(9)
Total	$ 116