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Acquisitions (Emtrol) - Additional Information (Detail) - Emtrol [Member] - USD ($)
$ in Millions
9 Months Ended
Nov. 03, 2014
Sep. 30, 2015
Nov. 02, 2014
Business Acquisition [Line Items]      
Equity interests acquired 100.00%    
Consideration paid in cash for acquisition $ 31.9    
Shares issued for acquired subsidiary 453,858    
Trading day period 30 days    
Fair value of common stock issued $ 5.8   $ 6.0
Revenue from acquired entity   $ 27.4  
Net income from acquired entity   $ 2.2  
Minimum [Member]      
Business Acquisition [Line Items]      
Restrictions on sale or transfer for periods range 1 year    
Maximum [Member]      
Business Acquisition [Line Items]      
Restrictions on sale or transfer for periods range 2 years