Acquisitions - Additional Durational Information (Detail)	12 Months Ended
Dec. 31, 2011 Entity
Total Other Acquisitions
Business Acquisition [Line Items]
Actual number of other acquisitions and purchase of intangible completed	78
Patents and developed technology
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life (in years)	6.3
Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life (in years)	6.6
Trade names and other
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life (in years)	4.2

The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period 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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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=6905858&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration