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Acquisitions (Emtrol) - Additional Information (Detail) - Emtrol [Member] - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Nov. 03, 2014 | Sep. 30, 2015 | Nov. 02, 2014
Business Acquisition [Line Items] |  |  |
Equity interests acquired | 100.00% |  |
Consideration paid in cash for acquisition | $ 31.9 |  |
Shares issued for acquired subsidiary | 453,858 |  |
Trading day period | 30 days |  |
Fair value of common stock issued | $ 5.8 |  | $ 6.0
Revenue from acquired entity |  | $ 27.4 |
Net income from acquired entity |  | $ 2.2 |
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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