Investment (Tables)

12 Months Ended

Dec. 31, 2017

Amboy Aggregates [Member]

Schedule Of Equity Method Investments [Line Items]

Equity Method Investments

The Company accounts for this investment under the equity method. The following is summarized financial information for this dissolved entity: 

		2017		2016		2015
Revenue	$	—	$	—	$	139
Gross profit (loss)		—		758		(1,363	)
Income (loss) from continuing operations		34		758		(3,152	)
Net income (loss)		34		758		(3,152	)

TerraSea Environmental Solutions [Member]

Schedule Of Equity Method Investments [Line Items]

Equity Method Investments

The Company accounts for this investment under the equity method. The following is summarized financial information for this dissolved entity:

		2016			2015
Revenue	$	—		$	6,960
Gross loss		(183	)		(3,800	)
Net loss		(183	)		(3,800	)