Redeemable Noncontrolling Interests - Summary of the Activity of Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Temporary Equity
Balance, beginning of period	$ 543,203		$ 423,632
Redemptions	(9,296)		(20,150)
LTIP Units issued in lieu of cash compensation			3,048
Net income (loss)	(6,457)		(18,375)
Other comprehensive loss	(181)		(3,627)
Contributions (distributions), net	(3,557)		93,545
Share-based compensation expense	3,591		16,606
Adjustment to redemption value	38,897		71,521
Balance, end of period	566,200		566,200
JBG Smith, LP
Temporary Equity
Balance, beginning of period	429,203	$ 436,673	423,632	$ 440,737
Redemptions	(9,296)	(3,553)	(20,150)	(13,769)
LTIP Units issued in lieu of cash compensation			3,048	3,836
Net income (loss)	(6,541)	(4,365)	(18,481)	(12,353)
Other comprehensive loss	(181)	(5,595)	(3,627)	(4,003)
Contributions (distributions), net	(2,883)	(2,874)	(5,781)	(8,714)
Share-based compensation expense	3,591	4,424	16,606	24,287
Adjustment to redemption value	38,455	20,235	57,101	14,924
Balance, end of period	452,348	$ 444,945	452,348	$ 444,945
Consolidated Real Estate Venture
Temporary Equity
Balance, beginning of period	114,000
Net income (loss)	84		106
Contributions (distributions), net	(674)		99,326
Adjustment to redemption value	442		14,420
Balance, end of period	$ 113,852		$ 113,852