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Acquisitions - Summary of Initial Consideration Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]    
Cash paid $ 34,396 $ 44,122
Professional Power Products, Inc. [Member]    
Business Acquisition [Line Items]    
Fair value of assets acquired 60,104  
Less liabilities assumed (5,805)  
Net assets acquired 54,299  
Less value of shares of Company common stock expected to be issued at date of acquisition (8,900)  
Less cash acquired (1,277)  
Cash paid $ 44,122