Description of Business and Significant Accounting Policies (Details)	9 Months Ended
	Sep. 30, 2013 segment subsidiary state
Property, Plant and Equipment [Line Items]
Terms of service agreement	Our agreements with clients typically provide for a one year service term, cancelable by either party upon 30 to 90 days’ notice after the initial 90-day period.
Service term	1 year
Initial period of service term	90 days
Number of reportable segments	2
Number of subsidiaries	2
Number of states subsidiary operates	3
Amortization period of inventories and supplies	24 months
Minimum [Member]
Property, Plant and Equipment [Line Items]
Days to notify cancellation of service	30 days
Property and equipment payment terms	24 months
Maximum [Member]
Property, Plant and Equipment [Line Items]
Days to notify cancellation of service	90 days
Property and equipment payment terms	60 months