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Restructuring and Severance - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]
Restructuring and severance	$ 1,825,000	$ 1,252,000	$ 2,874,000	$ 1,252,000	$ 1,800,000
General and Administrative Expense
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 300,000		$ 300,000

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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- 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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