Redeemable Equity Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2022
Class of Stock [Line Items]
(Increase) decrease to additional paid in capital	$ 0	$ 15	$ (35)	$ 96
Redeemable Non-controlling Interest in INREIT OP
Class of Stock [Line Items]
Distributions payable to noncontrolling interests	0		0		$ 10
MassMutual | Affiliated entity | Private Offering
Class of Stock [Line Items]
Shares repurchase amount, maximum	150,000		$ 150,000
Percentage of net process from sale of shares, maximum			100.00%
MassMutual | Class N Common Stock | Affiliated entity
Class of Stock [Line Items]
Share repurchase, minimum repurchase amount			$ 50,000
Stock redemption terms			3 years
MassMutual | Class N Common Stock | Affiliated entity | Private Offering
Class of Stock [Line Items]
Capital commitment						$ 400,000
Shares repurchase amount, maximum	200,000		$ 200,000
MassMutual | Redeemable Common Stock | Affiliated entity
Class of Stock [Line Items]
Share of entity's stock, minimum net asset value	$ 20,000		$ 20,000