XML 101 R87.htm IDEA: XBRL DOCUMENT v3.10.0.1
Selected Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 42,925 $ 46,873 $ 48,636 $ 58,588 $ 71,623 $ 77,798 $ 91,599 $ 99,551 $ 197,022 $ 340,571 $ 500,680
Net income attributable to Equity Commonwealth common shareholders $ 13,420 $ 30,767 $ 35,036 $ 185,602 $ (23,558) $ 31,215 $ (7,806) $ 21,817 $ 264,825 $ 21,668 $ 205,329
Net income (loss) attributable to Equity Commonwealth common shareholders per share—basic (in dollars per share) $ 0.11 $ 0.25 $ 0.29 $ 1.50 $ (0.19) $ 0.25 $ (0.06) $ 0.18      
Net income (loss) attributable to Equity Commonwealth common shareholders per share—diluted (in dollars per share) $ 0.11 $ 0.25 $ 0.29 $ 1.48 $ (0.19) $ 0.25 $ (0.06) $ 0.17