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Acquisition - (PMFG) - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 03, 2015
Sep. 30, 2016
Sep. 30, 2016
Jul. 12, 2016
Jul. 11, 2016
Sep. 30, 2015
Peerless Propulsys [Member]            
Business Acquisition [Line Items]            
Ownership interest in the equity and earnings       100.00%    
PMFG, Inc. [Member]            
Business Acquisition [Line Items]            
Equity interests acquired 100.00%          
Purchase price of acquisition $ 136,700          
Cash consideration per share $ 6.85 $ 9.49 $ 9.49      
Stock consideration per share $ 6.85          
Percentage of common stock converted into cash 44.50%          
Value of shares transferred for cash $ 64,600          
Trading day period 15 days          
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 $ 72,100      
Fair value of noncontrolling interest   4,212 4,212      
Building and land, fair value   24,787 24,787      
Revenue from acquired entity   23,900 73,800      
Income from acquired entity   $ 3,700 $ 8,600      
PMFG, Inc. [Member] | Peerless Propulsys [Member]            
Business Acquisition [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent   60.00% 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% 100.00%      
Business combination acquisition of minority interest caring value         $ 4,100  
Fair value of noncontrolling interest   $ 4,200 $ 4,200   5,300  
Adjustments to additional paid in capital non controlling 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        
Building and land, fair value   $ 6,200 $ 6,200      
Reduction of building and land acquired   5,200        
Reduction of non controlling interest acquired   $ 1,800        
PMFG, Inc. [Member] | Maximum [Member]            
Business Acquisition [Line Items]            
Common stock shares exchange ratio per share 0.6456          
PMFG, Inc. [Member] | Minimum [Member]            
Business Acquisition [Line Items]            
Common stock shares exchange ratio per share 0.5282