Commitments and Contingencies (Details Textual) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2015 employee	Mar. 31, 2015 case	Dec. 31, 2015 USD ($) case	Dec. 31, 2014 employee	Jun. 30, 2014 employee	Jun. 30, 2016 USD ($)	Mar. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Litigation settlement, amount			$ 5.0
Davida
Loss Contingencies [Line Items]
Number of employees provided class action notification | employee					658
Loss contingency, number of plaintiffs | employee	91
Christensen
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
Individual FLSA Cases
Loss Contingencies [Line Items]
Loss contingency, new claims filed, number | case			2
Ecoserv | Environmental services
Loss Contingencies [Line Items]
Escrow deposit							$ 8.0
Ecoserv | Environmental services | Released 18 months from closing date
Loss Contingencies [Line Items]
Escrow deposit						$ 4.0
Ecoserv | Environmental services | Released 9 months from closing date
Loss Contingencies [Line Items]
Escrow deposit						$ 4.0