OPERATING AND REPORTABLE SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Product revenue									$ 901,653	$ 675,684	$ 471,506
Service revenue									82,402	93,774	121,941
Total revenue	253,678	243,959	247,125	239,293	225,484	190,631	172,323	181,020	984,055	769,458	593,447
Adjusted EBITDA									13,232	77,780	61,065
Corporate overhead									(36,264)	(32,042)	(26,755)
Interest expense, net									(38,539)	(28,198)	(26,068)
Loss on extinguishment of debt									(2,373)	(15,898)	0
Income tax benefit (expense)									(11,391)	(2,523)	7,117
Depreciation									(16,388)	(13,381)	(8,367)
Amortization of intangibles									(6,555)	(6,671)	(3,957)
Stock-based compensation expense									(8,570)	(9,450)	(6,122)
Acquisition and integration expenses									(17,924)	(16,130)	(4,046)
Restructuring and other expenses and investments									(18,610)	(10,478)	(5,142)
Loss from continuing operations, net of income taxes									(143,382)	(56,991)	(12,275)
Total Capital Expenditures									13,829	25,525	10,658
Depreciation									16,388	13,381	8,367
Total Assets	824,713				936,858				824,713	936,858	642,376
Total Goodwill	573,323				571,337				573,323	571,337	317,026
Infusion Services
Segment Reporting Information [Line Items]
Product revenue									901,653	675,684	471,506
Service revenue									21,001	21,182	10,080
Total revenue									922,654	696,866	481,586
Adjusted EBITDA									6,501	60,686	35,421
Depreciation									(10,203)	(8,541)	(4,312)
Total Capital Expenditures									9,754	15,972	6,685
Depreciation									10,203	8,541	4,312
Total Assets	755,955				793,475				755,955	793,475	438,171
Total Goodwill	560,579				558,593				560,579	558,593	304,282
PBM Services
Segment Reporting Information [Line Items]
Service revenue									61,401	72,592	111,861
Adjusted EBITDA									6,731	17,094	25,644
Depreciation									0	0	0
Total Capital Expenditures									0	0	0
Depreciation									0	0	0
Total Assets	29,147				25,239				29,147	25,239	36,354
Total Goodwill	12,744				12,744				12,744	12,744	12,744
Corporate unallocated
Segment Reporting Information [Line Items]
Depreciation									(6,185)	(4,840)	(4,055)
Total Capital Expenditures									4,075	9,553	3,973
Depreciation									6,185	4,840	4,055
Total Assets	39,611				53,169				39,611	53,169	95,423
Assets from discontinued operations
Segment Reporting Information [Line Items]
Total Assets	0				64,959				0	64,959	63,245
Assets associated with discontinued operations, not sold
Segment Reporting Information [Line Items]
Total Assets	$ 0				$ 16				$ 0	$ 16	$ 9,183