Segment Information - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Information
Revenues	$ 128,210	$ 117,618	$ 258,863	$ 239,744
Medical equipment depreciation	14,930	16,077	30,057	31,247
Gross margin	42,015	38,728	87,783	78,613
Selling, general and administrative	30,814	28,798	64,955	60,095
(Gain) on settlement		(2,750)		(2,750)
Interest expense	13,219	13,061	26,514	26,130
Loss before income taxes and noncontrolling interest	(2,018)	(381)	(3,686)	(4,862)
Assets	799,077		799,077		$ 818,123
Medical Equipment Solutions
Segment Information
Revenues	74,396	74,940	153,056	155,170
Cost of revenue	33,415	33,213	67,211	71,494
Medical equipment depreciation	13,201	14,628	26,745	28,381
Gross margin	27,780	27,099	59,100	55,295
Assets	563,068		563,068		584,597
Clinical Engineering Solutions
Segment Information
Revenues	35,103	25,464	69,766	51,042
Cost of revenue	27,884	20,644	54,390	40,668
Gross margin	7,219	4,820	15,376	10,374
Assets	131,321		131,321		131,537
Surgical Services
Segment Information
Revenues	18,711	17,214	36,041	33,532
Cost of revenue	9,966	8,956	19,422	17,722
Medical equipment depreciation	1,729	1,449	3,312	2,866
Gross margin	7,016	$ 6,809	13,307	$ 12,944
Assets	$ 104,688		$ 104,688		$ 101,989