Severance and Other Charges (Detail) - Summarizes the activity in the Company`s accrual for severance and other charges (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Provision in 2012	$ 889
Payments and other settlements in 2012	(399)
Accrual at December 31, 2012	490
Employee Severance [Member]
Provision in 2012	572
Payments and other settlements in 2012	(266)
Accrual at December 31, 2012	306
Lease Termination Costs [Member]
Provision in 2012	184
Accrual at December 31, 2012	184
Other Charges [Member]
Provision in 2012	133
Payments and other settlements in 2012	$ (133)

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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