Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Unaudited Quarterly Results of Operations

	2016
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	137,135	$	145,367	$	114,632	$	103,546
Net income attributable to Equity Commonwealth common shareholders	39,421		71,254		84,391		10,263
Net income attributable to Equity Commonwealth common shareholders per share—basic	0.31		0.57		0.67		0.08
Net income attributable to Equity Commonwealth common shareholders per share—diluted	0.31		0.56		0.67		0.08

The following is a summary of our unaudited quarterly results of operations for 2017 and 2016 (dollars in thousands):

	2017
	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
Total revenues	$	99,551	$	91,599		$	77,798	$	71,623
Net income (loss) attributable to Equity Commonwealth common shareholders	21,817		(7,806		)	31,215		(23,558		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—basic	0.18		(0.06		)	0.25		(0.19		)
Net income (loss) attributable to Equity Commonwealth common shareholders per share—diluted	0.17		(0.06		)	0.25		(0.19		)