Non-controlling Interest - Operating Partnership Non-controlling Interest - Operating Partnership - Schedule of Changes in Net Income (Loss) attributable to Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Net income (loss) attributable to Invesco Mortgage Capital Inc.	$ 117,972	$ 89,003	$ 18,336	$ 138,790	$ (161,109)	$ (53,373)	$ 91,114	$ 52,578	$ 364,101	$ (70,790)	$ 348,607
Operating Partnership
Noncontrolling Interest [Line Items]
Net income (loss) attributable to Invesco Mortgage Capital Inc.										(70,790)	348,607
Net transfers from non-controlling interest										(798)	0
Change from net income (loss) attributable to Invesco Mortgage Capital Inc. common stockholders and transfers (to) from non-controlling interest										$ (71,588)	$ 348,607