Segment Information (Percentage Contribution Of Major Client In Revenue) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue, Major Client [Line Items]
Percentage of revenue from a major client	9.00%	11.00%	12.00%
Percentage of revenue and income earned in one geographic segment	99.00%
Amounts due from major customers	less than 1% of our accounts receivable balance	less than 1% of our accounts receivable balance
Housekeeping Services [Member]
Revenue, Major Client [Line Items]
Percentage of revenue from a major client	11.00%	11.00%	13.00%
Dietary Services [Member]
Revenue, Major Client [Line Items]
Percentage of revenue from a major client	5.00%	9.00%	11.00%