Non-controlling Interest - Operating Partnership - Additional Information (Detail) $ in Millions	Nov. 30, 2018 USD ($)
Noncontrolling Interest [Abstract]
Purchase of Operating Partnership units from non-controlling interest	$ 21.8

Payment For Purchase Of Operating Partnership Units From Noncontrolling Interest

No definition available.

Name:	ivr_PaymentForPurchaseOfOperatingPartnershipUnitsFromNoncontrollingInterest
Namespace Prefix:	ivr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration