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Acquisitions - (PMFG) - Additional Information (Detail) - PMFG, Inc. [Member] $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 03, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares
Business Acquisition [Line Items] |  |
Purchase price of acquisition | $ 136.7 |
Stock consideration per share | $ / shares | $ 6.85 |
Trading day period | 15 days |
Percentage of common stock converted into cash | 44.50% |
Cash consideration per share | $ / shares | $ 6.85 | $ 9.49
Value of shares transferred for cash | $ 64.6 |
Trading price | $ / shares | $ 9.6655 |
Exchange ratio | 0.6456 |
Shares of common stock in aggregate stock consideration | shares | 7,602,166 |
Percentage of cash consideration |  | 58.05%
Percentage of stock consideration |  | 41.95%
Value of stock recorded for purchase accounting |  | $ 72.1
Revenue from acquired entity |  | 40.8
Income from acquired entity |  | $ 2.2
Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Common stock shares exchange ratio per share | 0.6456 |
Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Common stock shares exchange ratio per share | 0.5282 |

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