Allocation of Purchase Price to Assets and Liabilities (Parenthetical) (Detail)	6 Months Ended
Jun. 30, 2012
Developed Technology Rights
Business Acquisition
Useful life of amortizable intangible assets (years)	5 years 2 months 12 days
Customer relationships
Business Acquisition
Useful life of amortizable intangible assets (years)	4 years
Trademarks and trade names
Business Acquisition
Useful life of amortizable intangible assets (years)	10 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration