Acquisitions (Details) (USD $)	3 Months Ended					0 Months Ended				1 Months Ended	12 Months Ended
	Mar. 31, 2013	Jul. 09, 2012 Surgical laser equipment service provider	Jul. 09, 2012 Surgical laser equipment service provider Debt assumed	Jul. 09, 2012 Surgical laser equipment service provider Contingent consideration	Mar. 31, 2012 Southern California equipment rental division of a medical equipment manufacturer	Mar. 31, 2012 Southern California equipment rental division of a medical equipment manufacturer Contingent consideration	Mar. 31, 2012 Southern California equipment rental division of a medical equipment manufacturer Customer relationships	Jan. 03, 2012 Florida-based laser surgical laser equipment service provider	Jan. 03, 2012 Florida-based laser surgical laser equipment service provider Debt assumed	Jan. 31, 2013 Florida-based laser surgical laser equipment service provider Holdback amounts	Dec. 31, 2012 Florida-based laser surgical laser equipment service provider Holdback amounts	Jan. 03, 2012 Florida-based laser surgical laser equipment service provider Holdback amounts
Cost of acquired entity
Total purchase price		$ 5,300,000			$ 800,000			$ 16,100,000
Cash paid		2,600,000						11,000,000
Liabilities incurred			1,000,000	1,700,000		400,000			3,200,000			1,900,000
Period for payment of contingent consideration						4 years
Medical equipment					400,000
Intangible assets							300,000
Holdback payment related to acquisition	$ 1,655,000									$ 1,700,000	$ 200,000