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Acquisitions (HEE) - Additional Information (Detail) - USD ($)
 12 Months Ended
Aug. 13, 2014
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Fair value adjustments to earnout liabilities   $ 11,222,000  
HEE [Member]      
Business Acquisition [Line Items]      
Cash paid on acquisition $ 7,000,000 700,000  
Shares issued for acquired subsidiary 34,626    
Fair value of common stock issued $ 500,000    
Trading day period 30 days    
Restrictions on sale or transfer for periods range 6 months    
Fair value adjustments to earnout liabilities $ 2,000,000 0  
First year estimated earn-out payable   700,000 $ 700,000
Remainder of estimated earn-out payable   600,000 1,300,000
Revenue from acquired entity   11,300,000 2,300,000
Income from acquired entity   $ 900,000 $ 100,000
HEE [Member] | Thirty Trading Days [Member]      
Business Acquisition [Line Items]      
Fair value of common stock issued $ 500,000