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Business Acquisition - Narrative (Details)
$ in Thousands
Aug. 05, 2015
USD ($)
GLM Concrete Solutions, LLC  
Business Acquisition [Line Items]  
Issued and outstanding membership interest acquired 49.00%
TAS Commercial Concrete  
Business Acquisition [Line Items]  
Payments to acquire businesses $ 112,000
Goodwill net of working capital adjustment 32,600
Goodwill expected to be tax deductible $ 32,600
Goodwill, tax basis, amortization period 15 years
Acquisition related costs $ 400
TAS Commercial Concrete | Minimum  
Business Acquisition [Line Items]  
Property and equipment useful life 3 years
TAS Commercial Concrete | Maximum  
Business Acquisition [Line Items]  
Property and equipment useful life 15 years