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Severance Charges - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Severance charges	$ 2,207,000us-gaap_SeveranceCosts1	$ 1,904,000us-gaap_SeveranceCosts1
Other restructuring charges		$ 303,000us-gaap_OtherRestructuringCosts

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

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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