Commitments and Contingencies (Details Textual)		1 Months Ended	3 Months Ended			6 Months Ended	12 Months Ended
	Oct. 25, 2016 employee	Mar. 31, 2015 case	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) case employee	Dec. 31, 2014 USD ($) employee	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Guarantee obligations due to closure of bonds							$ 384,000	$ 384,000
Asset retirement obligation			$ 962,000	$ 839,000		$ 962,000	$ 962,000	839,000
Minimum [Member]
Loss Contingencies [Line Items]
Operating lease term							1 year
Maximum [Member]
Loss Contingencies [Line Items]
Operating lease term							10 years
Settled litigation [Member] | Unfavorable regulatory action [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount				$ (5,000,000)
Wage and hour litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, new claims filed, number | case				2
Wage and hour litigation [Member] | Threatened litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | employee					5
Loss contingency, new claims filed, number | case		2
Loss contingency, pending claims, number | case		8
Wage and hour litigation [Member] | Threatened litigation [Member] | Unfavorable regulatory action [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount			700,000
Loss contingency, number of defendants | employee	379
Loss contingency, percentage of participating employees eligible for settlement	67.00%
Payments for legal settlement						4,500,000
Wage and hour litigation [Member] | Judicial ruling [Member] | Unfavorable regulatory action [Member]
Loss Contingencies [Line Items]
Loss contingency, employees eligible for settlement | employee				569
Ecoserv [Member] | Environmental services [Member]
Loss Contingencies [Line Items]
Escrow deposit					$ 8,000,000				$ 8,000,000	$ 8,000,000
Released 9 months from closing date | Ecoserv [Member] | Environmental services [Member]
Loss Contingencies [Line Items]
Escrow deposit					4,000,000				4,000,000	$ 4,000,000
Released 18 months from closing date | Ecoserv [Member] | Environmental services [Member]
Loss Contingencies [Line Items]
Escrow deposit			4,000,000.0		$ 4,000,000	4,000,000.0	$ 4,000,000.0		4,000,000
Letters of credit in favor of insurance company [Member]
Loss Contingencies [Line Items]
Operating leases, rent expense							21,000,000	22,600,000.0	$ 25,500,000.0
Other commitment			3,032,000	$ 3,332,000		3,032,000	3,032,000	3,332,000
Health claims [Member]
Loss Contingencies [Line Items]
Threshold for claims to be insured by third party insurers							250,000
Accrued liabilities for uninsured portion of claims			800,000	950,000		800,000	800,000	950,000
Workers compensation auto and general liability claims [Member]
Loss Contingencies [Line Items]
Threshold for claims to be insured by third party insurers							750,000
Accrued liabilities for uninsured portion of claims			$ 1,891,000	$ 2,467,000		$ 1,891,000	$ 1,891,000	$ 2,467,000