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Summary of Restructuring Activity (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Employee
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs	$ 34us-gaap_SeveranceCosts1
Number of employees reduced	6

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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