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Senior Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
Jul. 12, 2016
Sep. 30, 2015
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2016
Line Of Credit Facility [Line Items]                
Prepayment of outstanding debt         $ 4,300,000      
Credit facility, principal payment remainder of 2017         2,000,000      
Credit facility, principal payment 2018         8,500,000      
Credit facility, principal payment 2019         10,000,000      
Credit facility, principal payment 2020         $ 97,400,000      
Weighted average interest rate on outstanding borrowings         3.60%     3.26%
Interest rate swap, fair value               $ 200,000
Changes in fair value income (loss)       $ 500,000        
Credit facility, date of amendment Oct. 31, 2017       Jun. 09, 2017      
Maximum consolidated leverage ratio         325.00%      
ING Bank N.V. ("Aarding") [Member]                
Line Of Credit Facility [Line Items]                
Total borrowing capacity         $ 15,400,000     15,400,000
ING Bank N.V. ("Aarding") [Member] | Bank Overdrafts [Member]                
Line Of Credit Facility [Line Items]                
Total outstanding borrowings under Credit Facility         $ 1,600,000     0
Peerless Propulsys [Member]                
Line Of Credit Facility [Line Items]                
Ownership interest in the equity and earnings   100.00%            
Peerless Propulsys [Member] | PMFG, Inc. [Member]                
Line Of Credit Facility [Line Items]                
Interest rate         1.50%      
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   $ 5,300,000            
Promissory note due date         Jul. 11, 2019      
Ownership interest in the equity and earnings         100.00%      
Notes payable amount outstanding         $ 5,300,000     5,300,000
Debt Instrument, Term         30 days      
Notes payable description         The note is payable at the earlier of July 11, 2019 or 30 days subsequent to the sale of building and land that the Company owns in China.      
Building and land expected for sale, period         1 year      
Subsequent Event [Member]                
Line Of Credit Facility [Line Items]                
Maximum consolidated leverage ratio 375.00%              
Scenario Forecast [Member]                
Line Of Credit Facility [Line Items]                
Maximum consolidated leverage ratio           325.00% 350.00%  
Credit Agreement [Member]                
Line Of Credit Facility [Line Items]                
Unused credit availability under credit facility         $ 57,200,000     62,000,000
Letters of Credit [Member]                
Line Of Credit Facility [Line Items]                
Aggregate principal amount outstanding under the credit facilities         20,800,000     18,000,000
Bank Guarantee Facility [Member] | ING Bank N.V. ("Aarding") [Member]                
Line Of Credit Facility [Line Items]                
Aggregate principal amount outstanding under the bank gaurantee         4,600,000     5,300,000
China Facility [Member]                
Line Of Credit Facility [Line Items]                
Total borrowing capacity         $ 4,500,000     $ 4,300,000
Interest rate               4.79%
China Facility [Member] | US Dollar Borrowings [Member]                
Line Of Credit Facility [Line Items]                
Total outstanding borrowings under Credit Facility               $ 1,296,000