Change in the number of units for each class of partners' capital accounts during the year due to acquisitions. Partners include general, limited and preferred partners.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=66023778&loc=d3e9334-128500

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=66023778&loc=d3e9337-128500

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=66023778&loc=d3e9298-128500

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 05
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=66006417&loc=d3e8580-128490

Name:	us-gaap_PartnersCapitalAccountUnitsAcquisitions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Partners' Capital of Prologis, L.P. - Additional Information (Detail) - $ / shares shares in Millions	1 Months Ended		12 Months Ended
	Oct. 31, 2015	May 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Common Units
Shareholders Equity [Line Items]
Common limited partnership units, shares	0.2
Dividends per share entitled, issued in acquisition	$ 0.40
Common Units \| KTR Capital Partners and Affiliates [Member]
Shareholders Equity [Line Items]
Common limited partnership units, shares		4.5
Class A Common [Member]
Shareholders Equity [Line Items]
Common limited partnership units, shares	8.9
Weighted average fair value at date of issuance	$ 41.06
Dividends per share entitled, issued in acquisition	$ 0.64665
Class A units convertible into common limited partnership units			8.5	8.7
Limited partnership unit, redemption price per share			$ 43.11