Business Combination - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Business Combinations [Line Items]
Acquisition Date	Jan. 03, 2012
Gain recognized from re-measurement of the pre-acquisition equity	$ 5.8
Acquisition related costs	8.4
SandForce acquisition [Member]
Business Combinations [Line Items]
Revenue recognized related to SandForce business since date of acquisition	124.1
Griffin project [Member]
Business Combinations [Line Items]
Expected costs to complete	$ 20.3
Anticipated completion date of Griffin project	2013
Revenues for Griffin project is expected through	2018
Minimum [Member]
Business Combinations [Line Items]
Discount rate applied to projects	12.90%
Maximum [Member]
Business Combinations [Line Items]
Discount rate applied to projects	17.90%

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 59

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration