Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Acquisitions (Details)

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Description of Business - Acquisitions (Details)
3 Months Ended 6 Months Ended
Aug. 28, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Segment
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 07, 2018
USD ($)
Aug. 31, 2016
Business Acquisition [Line Items]              
Number of reportable segments | Segment       3      
Tax rate (in percentage)   25.60% 121.80%   60.80%    
Goldline, LLC              
Business Acquisition [Line Items]              
Purchase price $ 10,000,000            
Fair value of intangible assets acquired 6,400,000            
Fair value of tangible asset acquired 3,600,000            
Holdback amount 1,500,000            
Pro-forma revenue   $ 1,100,912,000 $ 1,680,738,000 $ 2,666,002,000 $ 3,845,686,000    
Pro-forma net income (loss)   $ 577,000 $ (205,000) $ 2,058,000 $ 325,000    
Pro-forma basic earnings (loss) per share | $ / shares   $ 0.08 $ (0.03) $ 0.29 $ 0.05    
Pro-forma dilutive earnings (loss) per share | $ / shares   $ 0.08 $ (0.03) $ 0.29 $ 0.05    
Tax rate (in percentage)   25.60% 37.50% 25.80% 37.50%    
Liabilities incurred for the acquisition $ 7,500,000            
Debt instrument, fees (in percentage)   2.00%   2.00%   2.00%  
Prepayment premium           $ 150,000  
Transition service agreement, term (in years) 2 years            
AM&ST Associates, LLC | AMST              
Business Acquisition [Line Items]              
Percentage of voting interests acquired (in percentage)   69.00%   69.00%     55.00%
AM&ST Associates, LLC | SilverTowne              
Business Acquisition [Line Items]              
Percentage of voting interests acquired (in percentage)   31.00%   31.00%     45.00%