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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]          
Common stock, shares issued 34,300,209 34,300,209 34,055,749    
Rent expense   $ 4.5 $ 4.0 $ 2.9  
Common Stock [Member]          
Related Party Transaction [Line Items]          
Common stock, shares issued 89,640 89,640      
Share purchased   105,000 0 61,500  
Common Stock [Member] | Current Segment President [Member]          
Related Party Transaction [Line Items]          
Share purchased 75,000 75,000      
Adwest, Zhongli, and Emtrol Subsidiaries [Member]          
Related Party Transaction [Line Items]          
Rent expense   $ 1.1 $ 1.1 $ 0.3  
Zhongli Subsidiary [Member]          
Related Party Transaction [Line Items]          
Purchase of inventory   0.8 0.3    
Sale of inventory   0.0 0.4    
Consulting Services [Member] | Related Party One [Member]          
Related Party Transaction [Line Items]          
Rent and other expenses paid   $ 0.4 0.4 0.4  
Consulting Services [Member] | Related Party Two [Member]          
Related Party Transaction [Line Items]          
Rent and other expenses paid     $ 0.1 $ 0.3 $ 0.1