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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended
	Jun. 30, 2013	Dec. 31, 2013 2013 Plan	Dec. 31, 2012 2012 Plan	Mar. 31, 2012 2012 Plan	Dec. 31, 2013 Safety And Security Systems 2013 Plan	Dec. 31, 2013 Corporate, Non-Segment [Member] 2013 Plan
Restructuring Cost and Reserve [Line Items]
Severance costs			$ 0.6	$ 0.9	$ 1.2	$ 0.3
Expected cost		0.4
Released remaining restructuring cost	$ 0.6

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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