Restructuring Charges - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011 Employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrual	$ 21,000	$ 614,000
Restructuring expenses	32,000	1,398,000
Severance charges, number of employees		129
Lease cancellation costs		200,000
Severance charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrual		500,000
Lease obligations
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrual		$ 100,000

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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