Acquisitions and Divestitures - Pro Forma (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Combinations [Abstract]
Net revenue	$ 464,662	$ 479,891	$ 989,965	$ 991,096
Net (loss) income	(23,944)	(45,622)	92,472	(178,006)
Net (loss) income attributable to Amneal Pharmaceuticals, Inc.	$ (11,996)	$ (15,535)	$ 101,438	$ (65,712)