Commitments and Contingencies (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2011	Sep. 01, 2011 Acquired Nsc Centers [Member] Centers	Dec. 31, 2011 Acquired Nsc Centers [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Contingent Purchase Price	$ 4,700,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities	3,100,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			$ 7,500,000
Business Acquisition [Line Items]
Number of business units of acquiree in single transaction		17