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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Emtrol (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 03, 2014
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 170,153 | $ 220,163 | $ 165,861 |
Emtrol [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  |  |  | $ 9,922
Property and equipment |  |  |  | 125
Goodwill |  |  |  | 24,998
Intangible – finite life |  |  |  | 12,890
Total assets acquired |  |  |  | 47,935
Current liabilities assumed |  |  |  | (10,173)
Net assets acquired |  |  |  | $ 37,762

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