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Restructuring and Severance - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring and severance charges	$ 294,000us-gaap_RestructuringCharges	$ 203,000us-gaap_RestructuringCharges	$ 1,597,000us-gaap_RestructuringCharges
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Unpaid severance and related charges	100,000
Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance charges	$ 300,000	$ 200,000	$ 1,600,000

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details