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Acquisitions - (PMFG) - Additional Information (Detail) - PMFG, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 03, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 11, 2016
Business Acquisition [Line Items] |  |  |  |
Equity interests acquired | 100.00% |  |  |
Purchase price of acquisition | $ 136,700 |  |  |
Cash consideration per share | $ 6.85 | $ 9.49 |  |
Stock consideration per share | $ 6.85 |  |  |
Trading day period | 15 days |  |  |
Percentage of common stock converted into cash | 44.50% |  |  |
Value of shares transferred for cash | $ 64,600 |  |  |
Trading price | $ 9.6655 |  |  |
Exchange ratio | 0.6456 |  |  |
Shares of common stock in aggregate stock consideration | 7,602,166 |  |  |
Percentage of cash consideration |  | 58.05% |  |
Percentage of stock consideration |  | 41.95% |  |
Value of stock recorded for purchase accounting |  | $ 72,100 |  |
Fair value of noncontrolling interest |  | 4,212 |  |
Revenue from acquired entity |  | 101,700 | $ 40,800 |
Income from acquired entity |  | $ 13,100 | $ 2,200 |
Peerless Propulsys [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 60.00% |  |
Percentage of ownership by parent in net income loss |  | 80.00% |  |
Promissory note issued in exchange for ownership in equity |  | $ 5,300 |  |
Promissory note due date |  | Jul. 11, 2019 |  |
Ownership interest in the equity and earnings |  | 100.00% |  |
Business combination acquisition of minority interest caring value |  |  |  | $ 4,100
Fair value of noncontrolling interest |  |  |  | $ 5,300
Additional paid in capital noncontrolling interest excess payment for existing equity investment |  | $ 1,200 |  |
Notes payable amount outstanding |  | $ 5,300 |  |
Debt Instrument, Term |  | 30 days |  |
Notes payable description |  | The note is payable at the earlier of July 11, 2019 or thirty days subsequent to the sale of building and land that the Company owns in China. |  |
Building and land expected for sale, period |  | 1 year |  |
Asset held for sale, carrying value |  | $ 5,400 |  |
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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