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Acquisitions (Emtrol) - Additional Information (Detail) - Emtrol [Member] - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 03, 2014 | Dec. 31, 2015 | Dec. 31, 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 |  |
Fair value of common stock issued | $ 5.8 |  |
Trading day period | 30 days |  |
Revenue from acquired entity |  | $ 33.7 | $ 9.8
Income from acquired entity |  | $ 3.3 | $ 1.3
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 |  |
Thirty Trading Days [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of common stock issued | $ 6.0 |  |

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