Annual report pursuant to Section 13 and 15(d)

Discontinued Operations - Additional Information (Detail)

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Discontinued Operations - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Oct. 21, 2013
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash received sale of subsidiary   $ 47,500,000 [1]  
Accounts receivable   2,168,000 35,618,000
Credit agreement borrowings maximum   35,000,000  
Revolving line of credit agreement, expiration date   Jul. 30, 2015  
Proceeds from loans 19,621,941    
Early termination fee 350,000    
GVE Newco, LLC
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total consideration received for sale of subsidiary 51,700,000    
Cash received sale of subsidiary 47,500,000    
Amount of shares received for divestiture 666,978    
Accounts receivable 2,000,000    
Accrued payable 1,000,000    
GVE Newco, LLC | Class A Common Stock
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Common stock value $ 1,200,000    
[1] Cash flows in 2013 include the $25.0 million gain from the sale of RSOL stock, the sale of GVE and the closure of the DRTV Business Unit.