Restructuring and Other Items - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,412,000	$ 4,500,000
Lease termination and exit costs	500,000
Resource rationalizations	3,900,000
1st Quarter 2011 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		100,000
2012 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Lease termination and exit costs		1,200,000
Resource rationalizations		$ 3,400,000

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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