Noncontrolling Interest - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Abstract]
Common stock, conversion term	6 months
Common stock, conversion basis	1
EQC Operating Trust
Noncontrolling Interest [Line Items]
Noncontrolling interest, weighted average ownership percentage by parent	99.82%	99.96%	99.96%