Restructuring and Acquisition-Related Charges - Additional information (Detail) (USD $)	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2012	Mar. 31, 2012 Restructuring 2012 Program	Mar. 31, 2011 Restructuring 2011 Programs	Dec. 31, 2011 Restructuring 2011 Programs
Restructuring and acquisition-related charges	$ 25,893,000	$ 26,893,000
Restructuring Charges	24,200,000	23,299,000
Acquisition-related charges	1,700,000	3,600,000
Elimination of positions				298	33	787
Date of completion of workforce reduction and/or consolidation of facilities			2015	2012		2012
Lease termination costs for facilities	$ 3,700,000	$ 18,700,000

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.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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