Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Segment Information
Revenues	$ 101,819	$ 89,344	$ 312,394	$ 259,214
Medical equipment depreciation	18,104	17,006	52,329	51,678
Gross margin	34,510	32,769	117,571	93,986
Selling, general and administrative	29,885	22,756	86,251	72,247
Acquisition and integration expenses	58	622	352	2,621
Loss on extinguishment of debt	12,339		12,339
Interest expense	13,530	15,122	43,534	39,572
Loss before income taxes and non controlling interest	(21,302)	(5,731)	(24,905)	(20,454)
Total Company Assets	960,524		960,524		936,932
Medical Equipment Outsourcing
Segment Information
Revenues	74,134	69,002	226,599	205,159
Cost of revenue	28,736	23,814	77,273	72,785
Medical equipment depreciation	18,104	17,006	52,329	51,678
Gross margin	27,294	28,182	96,997	80,696
Total Company Assets	464,888		464,888		461,285
Technical and Professional Services
Segment Information
Revenues	20,066	13,852	62,545	36,083
Cost of revenue	14,455	10,540	47,109	26,650
Gross margin	5,611	3,312	15,436	9,433
Total Company Assets	83,964		83,964		84,483
Medical Equipment Sales And Remarketing
Segment Information
Revenues	7,619	6,490	23,250	17,972
Cost of revenue	6,014	5,215	18,112	14,115
Gross margin	1,605	1,275	5,138	3,857
Total Company Assets	18,603		18,603		18,603
Corporate and Unallocated
Segment Information
Total Company Assets	$ 393,069		$ 393,069		$ 372,561