Goodwill and Intangible Assets - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Asset	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill impairment charges	$ 69,500		$ 69,483	$ 0
Amortization expense		$ 2,640	3,390	$ 4,736
Net intangible assets, end of year	7,895	$ 5,255	$ 7,895
Number of infinite-lived intangible assets | Asset		1
Tony Bagliore Concrete, Inc. (TBC) | Customer Relationships
Business Acquisition [Line Items]
Amortization expense		$ 2,600
TAS Commercial Concrete | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired					$ 18,800
Acquired finite-lived intangible assets, useful life					8 years
Marine
Business Acquisition [Line Items]
Goodwill impairment charges	33,800
Concrete
Business Acquisition [Line Items]
Goodwill impairment charges	$ 35,700