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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014 Employee Severance	Mar. 31, 2014 Employee Severance	Dec. 31, 2013 Safety And Security Systems Two Thousand and Thirteen Restructuring Plan [Member]	Dec. 31, 2013 Corporate, Non-Segment [Member] Two Thousand and Thirteen Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			$ 1.2	$ 0.3
Adjustments	$ 0.1	$ (0.2)

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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