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Summary of Restructuring Activity (Detail) (USD $)	3 Months Ended	6 Months Ended
Summary of Restructuring Activity (Detail) (USD $)	Dec. 31, 2013	Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance		$ 1,591,000
Restructuring costs	1,700,000
Cash payments		(170,000)
Restructuring Reserve, Ending Balance	$ 1,591,000	$ 1,421,000

- 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.

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