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Acquisitions (Emtrol) - Additional Information (Detail) - Emtrol [Member] - USD ($) $ in Millions	Nov. 03, 2014	Nov. 02, 2014
Business Acquisition [Line Items]
Membership interest acquired	100.00%
Consideration paid in cash for acquisition	$ 31.9
Shares issued for acquired subsidiary	453,858
Trading day period	30 days
Value assigned to the equity issued	$ 5.8	$ 6.0
Minimum [Member]
Business Acquisition [Line Items]
Restrictions on sale or transfer for periods range	1 year
Maximum [Member]
Business Acquisition [Line Items]
Restrictions on sale or transfer for periods range	2 years

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