Business Combination (Details) $ in Thousands, ft² in Millions		3 Months Ended								12 Months Ended
	Oct. 08, 2013 USD ($) ft² bldg	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Sep. 27, 2013 USD ($)
Business Combination, Costs Incurred or to be Incurred [Abstract]
Deferred financing costs		$ 11,917				$ 11,917				$ 11,917	$ 11,917
Debt Instrument, Face Amount		3,154,987								3,154,987
Business Acquisition, Pro Forma Information [Abstract]
Operating revenue		$ 199,382	$ 198,972	$ 203,518	$ 206,901	$ 203,685	$ 198,356	$ 192,960	$ 197,630	808,773	792,631	$ 645,930
Operating Income (Loss)										$ 257,132	$ 257,306	$ 202,799
Senior Notes [Member] | 4.40% senior unsecured note [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Debt Instrument, Face Amount													$ 450,000
Common Stock [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Number of common shares issued | shares										1,328,017	1,957,378	27,968,740
Cabot Industrial Value Fund III [Member]
Business Combination, Description [Abstract]
Name of Acquired Entity	Cabot Industrial Fund III Operating Partnership, L.P.
Percentage of Voting Interests Acquired	100.00%
Leaseable square feet (unaudited) | ft²	23.0
Business Acquisition, Date of Acquisition [Abstract]
Date of Acquisition	Oct. 08, 2013
Business Combination, Consideration Transferred [Abstract]
Total purchase price of acquisition	$ 1,469,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Land and land improvements	247,393
Building and improvements	1,152,717
Operating real estate	1,400,110
Intangible - in-place leases/market rent	97,396
Other assets	4,953
Total assets	1,502,459
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Mortgage loans	243,230
Other liabilities	32,958
Intangible market rent	5,737
Total liabilities	281,925
Net assets acquired	1,220,534
Business Combination, Costs Incurred or to be Incurred [Abstract]
Acquisition costs												$ 7,600
Financing fees												4,200
Deferred financing costs	2,000
Mortgage loans acquired before fair value adjustment	229,800
Stock issuance costs												35,300
Business Acquisition, Pro Forma Information [Abstract]
Total operating revenue												750,896
Net income available to common shareholders												211,601
Operating revenue												31,400
Operating Income (Loss)												$ 22,000
Cabot Industrial Value Fund III [Member] | Mortgages [Member]
Business Combination, Consideration Transferred [Abstract]
Assumption of mortgage debt from acquisition	$ 229,800
Cabot Industrial Value Fund III [Member] | Senior Notes [Member] | 4.40% senior unsecured note [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Deferred financing costs													$ 3,900
Cabot Industrial Value Fund III [Member] | Common Stock [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Number of common shares issued | shares												24,200,000
Cabot Industrial Value Fund III [Member] | Leases, Acquired-in-Place [Member]
Acquired Finite-Lived Intangible Assets [Abstract]
Weighted average useful life of acquired of in-place lease intangible assets	4 years 5 months
Industrial Property [Member] | Cabot Industrial Value Fund III [Member]
Business Combination, Description [Abstract]
Number of buildings | bldg	177