Commitments and Contingencies Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Restructuring expenses	$ 433	$ 176	$ 441	$ 401
Restructuring reserve	541	155	$ 541	155	$ 281	$ 194
Settlement agreement date			February 17, 2015
Settlement agreement terms			Under the terms of the consent decree, USM is to (a) pay an aggregate of $1.0 million (i) for monetary relief to the members of the class, (ii) for awards to the class representative plaintiffs, (iii) for California Labor Code Private Attorney General Act payments to the State of California for an immaterial amount, and (iv) for all costs of notice and administration of the claims process, (b) pay to counsel for the class an aggregate of $1.3 million, of which $0.25 million is to be allocated for their reimbursable costs and litigation expenses and $1.05 million is to be allocated for attorneys’ fees, and (c) establish procedures to monitor USM’s California subcontractors providing janitorial services to its Customer designed principally to ensure janitorial employees of those subcontractors are paid no less than minimum wage.
Class Action Aggregate Monetary Portion [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount			$ 1,000
Payment for litigation settlement			1,000
Class Action Aggregate Counsel Portion [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount			1,300
Class Action Litigation Expenses [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount			250
Class Action Attorney Fees [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount			1,050
Employee Severance [Member]
Loss Contingencies [Line Items]
Restructuring expenses	500	$ 200	547	200
Facility Closing [Member]
Loss Contingencies [Line Items]
Restructuring expenses				$ 200
Reversal of restructuring expenses	$ (100)		$ (106)