Assets Held for Sale or Contribution - Summary of Assets Held for Sale or Contribution (Detail) ft² in Thousands, $ in Thousands	Sep. 30, 2018 USD ($) ft² Property	[1]	Dec. 31, 2017 USD ($) ft² Property
Long Lived Assets Held For Sale [Line Items]
Total assets held for sale or contribution	$ 761,575		$ 342,060
Total liabilities associated with assets held for sale or contribution – included in Other Liabilities	$ 23,028		$ 9,341
Disposal Group Held for Sale Not Discontinued Operations
Long Lived Assets Held For Sale [Line Items]
Number of operating properties | Property	69		22
Square feet | ft²	12,767		5,384

[1] In October 2018, we and certain co-investment ventures sold a portfolio of operating buildings and land in Europe and the U.S. in a single transaction. Included in Assets Held for Sale Or Contribution is $412.2 million of properties owned by Prologis and our consolidated co-investment venture at September 30, 2018.