Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 Segment	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments									3
REVENUES [Abstract]
Total revenues	$ 84,953,000	$ 81,892,000	$ 77,012,000	$ 73,854,000	$ 71,520,000	$ 69,634,000	$ 63,287,000	$ 51,717,000	$ 317,711,000	$ 256,158,000	$ 136,920,000
Net revenue from customers located in foreign countries									27,300,000	29,400,000	5,300,000
GROSS PROFIT [Abstract]
Total gross profit	46,970,000	43,697,000	42,092,000	39,145,000	41,971,000	40,093,000	35,727,000	30,901,000	171,904,000	148,692,000	79,689,000
Goodwill [Abstract]
Goodwill	29,831,000				32,159,000				29,831,000	32,159,000	11,863,000
Impairment of goodwill	0								0	0
Akorn India Private Limited [Member]
REVENUES [Abstract]
Net revenue from customers located in foreign countries									15,800,000	16,700,000
Hospital Drugs & Injectables [Member]
REVENUES [Abstract]
Total revenues									179,625,000	129,723,000	55,077,000
GROSS PROFIT [Abstract]
Total gross profit									104,473,000	83,413,000	30,057,000
Ophthalmic [Member]
REVENUES [Abstract]
Total revenues									114,515,000	103,765,000	68,591,000
GROSS PROFIT [Abstract]
Total gross profit									63,481,000	58,785,000	43,054,000
Goodwill [Abstract]
Goodwill	11,863,000				11,863,000				11,863,000	11,863,000
Contract Services [Member]
REVENUES [Abstract]
Total revenues									23,571,000	22,670,000	13,252,000
GROSS PROFIT [Abstract]
Total gross profit									3,950,000	6,494,000	6,578,000
Goodwill [Abstract]
Goodwill	$ 17,968,000				$ 20,296,000				$ 17,968,000	$ 20,296,000