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Business Acquisition - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 10, 2017
Aug. 05, 2015
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 09, 2017
Business Acquisition [Line Items]              
Federal statutory tax rate         35.00% 35.00%  
Tony Bagliore Concrete, Inc. (TBC)              
Business Acquisition [Line Items]              
Payments to acquire businesses $ 6,000            
Contingent considerations     $ 2,000 $ 2,000      
Contingent considerations, fair value             $ 456
Goodwill, net of working capital adjustment             $ 3,100
Minimum | Tony Bagliore Concrete, Inc. (TBC)              
Business Acquisition [Line Items]              
Property and equipment useful life   3 years          
Maximum | Tony Bagliore Concrete, Inc. (TBC)              
Business Acquisition [Line Items]              
Property and equipment useful life   15 years