Annual report pursuant to Section 13 and 15(d)

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

v3.7.0.1
Acquisitions of Businesses and Other Intangibles - Additional Information (Detail)
$ in Millions
 8 Months Ended 12 Months Ended
Sep. 01, 2016
USD ($)
shares
Feb. 05, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
May 06, 2016
USD ($)
Location
Mar. 01, 2016
USD ($)
Sep. 01, 2015
USD ($)
Business Acquisition [Line Items]                  
Business acquisition consideration payable     $ 3.0 $ 3.0 $ 8.8 $ 12.4      
Revenue       178.0 163.4        
Operating income       2.7 0.2        
Net income (loss)       0.2 (1.7)        
Amortization of intangible assets       5.2 4.0 $ 5.2      
Revenue from the date of acquisition         16.3        
Net income from the date of acquisition         2.9        
Backlog                  
Business Acquisition [Line Items]                  
Amortization of intangible assets       $ 3.3 $ 2.6        
TNT                  
Business Acquisition [Line Items]                  
Number of municipalities covered | Location             120    
Business acquisition consideration payable [1]             $ 4.1    
Revenue from the date of acquisition     17.5            
Net income from the date of acquisition     $ 1.6            
DPI Management                  
Business Acquisition [Line Items]                  
Business acquisition cash consideration payment   $ 0.1              
Business acquisition, number of shares issued | shares 17,544                
Business acquisition, number of shares issued value $ 0.1                
DPI Management | Paid in Cash in 2015                  
Business Acquisition [Line Items]                  
Business acquisition consideration payable                 $ 0.2
DPI Management | Paid in Cash in 2016                  
Business Acquisition [Line Items]                  
Business acquisition consideration payable               $ 0.2  
[1] Contingent consideration is based on expected revenue and adjusted EBITDA, and was capped at $5.0 million based on the original agreement.