Restructuring and Acquisition-Related Charges - Additional information (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Restructuring and acquisition-related charges	$ 20,302,000	$ 12,561,000	$ 68,411,000	$ 40,902,000
Restructuring Charges	16,900,000	9,700,000	58,100,000	35,400,000
Acquisition-related charges	3,400,000	2,900,000	10,300,000	5,500,000
Date of completion of workforce reduction and/or consolidation of facilities	2015
Lease termination costs for facilities	$ 1,900,000		$ 24,300,000
Restructuring First Quarter 2011 Program
Elimination of positions	33
Date of completion of workforce reduction and/or consolidation of facilities	2011
Restructuring Second Quarter 2011 Program
Elimination of positions	205
Date of completion of workforce reduction and/or consolidation of facilities	2011
Restructuring Third Quarter 2011 Program
Elimination of positions	208
Date of completion of workforce reduction and/or consolidation of facilities	2011

Estimated Decrease in Number of Employees Due to Restructuring

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- Definition

Restructuring and Related Activities, Completion Year

+ Details

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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 59

+ Details

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- Definition

The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 146

-Paragraph 20

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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- Definition

Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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- Definition

The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

+ Details

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