Business Combinations (Details) $ / shares in Units, $ in Thousands			3 Months Ended	8 Months Ended
		Oct. 16, 2014 USD ($) facility	Sep. 06, 2014 USD ($) $ / shares	Sep. 12, 2015 USD ($)	Sep. 06, 2014 USD ($) $ / shares	Jan. 03, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 22,963		$ 23,036
Total revenues			$ 107,256		$ 321,163
Net income (loss)			$ 588		$ (2,191)
Basic (in dollar per share) | $ / shares			$ 0.03		$ (0.12)
Diluted (in dollar per share) | $ / shares			$ 0.03		$ (0.12)
FCC Environmental Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Number of Facilities | facility		34
Acquisition Gross Cash Paid		$ 90,000
Payments to Acquire Businesses, Gross		88,800
Accounts receivable		20,430
Inventory		7,899
Other current assets		6,683
Deferred taxes		1,748
Property, plant, & equipment	[1],[2]	49,752
Equipment at customers		420
Intangible assets		9,808
Goodwill	[2],[3]	13,168
Accounts payable		(12,453)
Accrued salaries, wages, and benefits		(2,039)
Taxes payable		(2,209)
Other current liabilities		(1,378)
Capital lease obligations	[1]	(5,918)
Net cash paid		85,911
Accounts receivable adjustment				1,600
Other current assets adjustment				100
Property and equipment adjustment				2,000
Goodwill, purchase accounting adjustments				$ 3,600
Oil Business Segment [Member] | FCC Environmental Acquisition [Member]
Business Acquisition [Line Items]
Goodwill		7,100
Environmental Services Segment [Member] | FCC Environmental Acquisition [Member]
Business Acquisition [Line Items]
Goodwill		$ 6,100

[1] Subsequent to the closing date, the Company modified the leases acquired from FCC Environmental, resulting in the classification of the leases as Operating leases under the new lease terms. The change in lease terms decreased both Property, plant, & equipment and Capital lease obligations by $5.9 million.

[2] The Company has retrospectively adjusted amounts that were recognized at the acquisition date to reflect new information about the facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date. These adjustments are related to the Company's valuation of accounts receivable, other current assets, property, plant and equipment, and goodwill acquired. Such adjustments resulted in a net decrease of $1.6 million in accounts receivable, a net decrease of $0.1 million in other current assets, a net decrease of $2.0 million in property, plant and equipment and a net increase of $3.6 million in goodwill. The Company's balance sheet as of January 3, 2015 has been retrospectively restated to reflect these adjustments.

[3] Goodwill recognized from the acquisition of FCC Environmental represents the excess of the fair value of the net assets acquired over the purchase price, and is based upon the Company's expectations of synergies from combining the operations of FCC Environmental and the Company, and the value of intangible assets that are not separately recognized, such as the assembled workforce. Goodwill of $7.1 million and $6.1 million were assigned to the Environmental Services and Oil Business segments, respectively. All goodwill is expected to be deductible for income tax purposes.