Condensed Combined Statement of Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Parent Equity	Noncontrolling Interests
BALANCE (beginning of period) at Dec. 31, 2016	$ 2,121,984	$ 2,121,689	$ 295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to JBG SMITH Properties	17,659	17,659
Deferred compensation shares and options, net	1,294	1,294
Contributions from Vornado Realty Trust, net	21,203	21,203
BALANCE, (end of period) at Jun. 30, 2017	$ 2,162,140	$ 2,161,845	$ 295