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Acquisitions (Met-Pro) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 27, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |
Acquisition related expenses included in pro-forma results |  | $ 17.7 | $ 1.3 | $ 13.9
Nonrecurring expenses included in pro-forma results |  | 3.7 | $ 26.6 | 3.5
Met-Pro [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration per share | $ 13.75 |  |  |
Stock consideration per share |  |  | $ 13.75 |
Trading day period |  |  | 15 days |
Exchange ratio | 108.43% |  |  |
Percentage of common stock converted into cash |  |  | 51.60% |
Value of shares transferred for cash |  |  | $ 104.4 |
Trading price |  |  | $ 12.6814 |
Shares of common stock in aggregate stock consideration |  |  | 7,726,235 |
Percentage of cash consideration |  |  | 77.56% |
Percentage of stock consideration |  |  | 22.44% |
Value of stock recorded |  |  | $ 98.0 |
Consideration for cancelling of options and restricted stock units |  |  | 4.9 |
Revenue from acquired entity |  | 80.9 | 83.1 | 30.5
Income from acquired entity |  | $ 14.3 | $ 14.6 | $ 0.9
Met-Pro [Member] | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exchange ratio | 135.20% |  |  |
Met-Pro [Member] | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exchange ratio | 100.00% |  |  |

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