Equity of the Parent Company (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Common stock and OP units [Member]	Jun. 30, 2011 Noncontrolling Interests [Member]	Jun. 30, 2011 Restricted stock issued to board members [Member]	Jun. 30, 2011 Restricted Stock Issued to Employees [Member]	Jun. 30, 2011 BIOMED REALTY TRUST, INC. [Member]	Dec. 31, 2010 BIOMED REALTY TRUST, INC. [Member]
Restricted stock awards issued				15,085	330,544
Stocks retired in lieu of cash payments for taxes	129,342
Shares forfeited	24,465
Common stock, shares outstanding		131,259,602				131,259,602	131,046,509
Partnership units, shares outstanding		2,593,538
LTIP Units, shares outstanding		386,441
Minority interest redemption value			$ 56.6
Average closing price per share			$ 19.00
Number of trading days			10