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Share-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restructuring charges related to the termination of former Chief Executive Officer	$ 1,064,000	$ 2,411,000	$ 7,480,000	$ 2,411,000
Accelerated Share Based Compensation [Member] \| Chief Executive Officer [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restructuring charges related to the termination of former Chief Executive Officer			$ 1,300,000

- 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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