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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, 2017 | 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 |  | 89,400 | 101,700 | $ 40,800 |
Income from acquired entity |  | $ 6,700 | 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 |  | As of December 31, 2017, $5.3 million of the note payable was outstanding and 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. |  |  |
Asset held for sale, carrying value |  | $ 5,400 |  |  |
Interest rate |  | 1.50% |  |  |
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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