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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