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Acquisitions - (PMFG) - Additional Information (Detail) - PMFG, Inc. [Member]
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 03, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
Business Acquisition [Line Items]    
Cash consideration per share | $ / shares $ 6.85 $ 9.49
Stock consideration per share | $ / shares $ 6.85  
Equity interests acquired 100.00%  
Purchase price of acquisition $ 136.7  
Percentage of common stock converted into cash 44.50%  
Value of shares transferred for cash $ 64.6  
Trading day period 15 days  
Trading price | $ / shares $ 9.6655  
Exchange ratio 0.6456  
Shares of common stock in aggregate stock consideration | shares 7,602,166  
Percentage of cash consideration   58.05%
Percentage of stock consideration   41.95%
Value of stock recorded for purchase accounting   $ 72.1
Revenue from acquired entity   12.6
Net income from acquired entity   $ 0.9
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