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%

Additional paid-in capital noncontrolling interest excess payment for existing equity investment.

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Business combination acquisition of acquisition of Less than 100 percent non-controlling interest caring value.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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