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Indebtedness - Activity (Details) - USD ($) $ in Thousands		12 Months Ended
Indebtedness - Activity (Details) - USD ($) $ in Thousands	Oct. 08, 2013	Dec. 31, 2015	Dec. 01, 2015	Aug. 01, 2015	Mar. 01, 2015	Dec. 31, 2014	Aug. 01, 2014	Mar. 01, 2014	Dec. 31, 2013	Sep. 27, 2013
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,154,987
Debt, Weighted Average Interest Rate		4.60%				5.00%			5.10%
Credit Facility [Domain] \| Old Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 500,000
Credit Facility [Domain] \| New Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 800,000
Senior Notes [Member] \| 5.65% Senior Note [Member]
Debt Instrument [Line Items]
Stated Interest Rate							5.65%
Repurchased face amount of debt							$ 200,000
Senior Notes [Member] \| 4.40% senior unsecured note [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 450,000
Senior Notes [Member] \| 5.125% Senior Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate					5.125%
Repurchased face amount of debt					$ 300,000
Senior Notes [Member] \| 3.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate					3.75%
Debt Instrument, Face Amount					$ 400,000
Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Jan. 01, 2016
Debt Instrument, Maturity Date Range, End		Dec. 31, 2033
Mortgages [Member] \| 7.0% Mortgage [Member]
Debt Instrument [Line Items]
Stated Interest Rate				7.00%
Repurchased face amount of debt				$ 105,800
Mortgages [Member] \| 7.5% Mortgage [Member]
Debt Instrument [Line Items]
Stated Interest Rate			7.50%
Repurchased face amount of debt			$ 59,700
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 2,596,543
Unsecured Debt [Member] \| 3.435% unsecured notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate			3.40%
Repurchased face amount of debt			$ 16,000
Cabot Industrial Value Fund III [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Assumption of mortgage debt from acquisition	$ 229,800