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Business Combination (Details Narrative) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 03, 2016
Dec. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business acquisitions revenue     $ 69,257 $ 65,222 $ 62,454 $ 64,711 $ 70,314 $ 78,260 $ 77,959 $ 81,600 $ 261,644 $ 308,133 $ 390,011
Business acquisitions net income loss     $ (1,826) [1] $ (1,439) $ (2,557) [2] $ (184) $ (199) [3] $ 676 $ (619) [4] $ 2,186 $ (6,006) 2,044 14,972
Asset useful life                     8 years 9 months 18 days    
Amortization expense of intangible assets                     $ 1,700 1,800 $ 1,700
Vertex Acquisition [Member]                          
Net assets purchased $ 32,370                        
Current adjustment 100                        
Total purchase price before adjustment 32,300                        
Amount of goodwill deductible for tax purposes $ 1,000                        
Business acquisitions revenue   $ 7,000                 284,310 342,129  
Business acquisitions net income loss   $ 200                 (5,466) $ 3,560  
Acquisition-related costs                     $ 900    
Business combination unrecognized description                    

Amortization expense to be recognized on the acquired intangible assets is expected to be $0.8 million per year in 2017 through 2024 and $0.6 million in 2025.

    
Vertex Acquisition [Member] | Trade Names [Member]                          
Indefinitelived intangible assets acquired                     $ 2,100    
Vertex Acquisition [Member] | Customer Relationships [Member]                          
Intangible asset acquired                     $ 7,000    
Asset useful life                     9 years    
Amortization expense of intangible assets                     $ 200    
[1] During the fourth quarter of 2016, the Company recorded a charge of $483 of additional cost of sales expense that related to the first three quarters of 2016 and was immaterial to each quarter.
[2] During the second quarter of 2016, the Company recorded a non-cash impairment charge of $2,384. See Note 4 for additional information.
[3] During the fourth quarter of 2015, the Company recorded a non-cash impairment charge of $423. See Note 4 for additional information.
[4] During the second quarter of 2015, the Company recorded a non-cash impairment charge of $2,994. See Note 4 for additional information.