Quarterly report pursuant to Section 13 or 15(d)

Acquisitions of Businesses and Other Intangibles - Additional Information (Detail)

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Acquisitions of Businesses and Other Intangibles - Additional Information (Detail)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Aug. 05, 2015
USD ($)
shares
May 31, 2016
USD ($)
Location
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Business acquisition cash consideration     $ 1,015  
Backlog        
Business Acquisition [Line Items]        
Amortization of customer backlog included from proforma results     $ 3,300 $ 2,600
Energy Source        
Business Acquisition [Line Items]        
Business acquisition aggregate purchase consideration $ 31,500      
Business acquisition cash consideration 10,000      
Business acquisition, promissory notes issued 10,000      
Business acquisition, contingent consideration 1,800      
Business acquisition, number of shares issued value 10,000      
Energy Source | Common Stock        
Business Acquisition [Line Items]        
Business acquisition, value of equity issued $ 9,700      
Business acquisition, number of shares issued | shares 869,565      
Business acquisition, number of shares issued value $ 9,500      
TNT        
Business Acquisition [Line Items]        
Business acquisition aggregate purchase consideration   $ 14,700    
Business acquisition cash consideration   8,600    
Business acquisition, promissory notes issued   2,000    
Business acquisition, contingent consideration   $ 4,100    
Number of municipalities covered | Location   120    
Working capital adjustment   $ 600