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Acquisition of Noncontrolling Interest - (PMFG) - Additional Information (Detail) - Peerless Propulsys [Member] - PMFG, Inc. [Member] - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 11, 2016 | Dec. 31, 2018
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 | $ 5.3 |
Promissory note due date | Jul. 11, 2019 |
Ownership interest in the equity and earnings | 100.00% |
Business combination acquisition of minority interest caring value | $ 4.1 |
Fair value of noncontrolling interest | 5.3 |
Additional paid in capital noncontrolling interest excess payment for existing equity investment | $ 1.2 |
Notes payable amount outstanding |  | $ 1.7
Notes payable description |  | As of December 31, 2018, the outstanding balance of the note was $1.7 million and was paid off in January 2019.
Interest rate |  | 1.50%

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