Stockholders' Equity of Prologis Inc. - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) Agent shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares
Shareholders Equity [Line Items]
Common stock shares authorized to be issued | shares	1,100,000,000
Common stock, shares authorized | shares	1,000,000,000
Beneficial interest of outstanding shares	50.00%
Beneficial interest of outstanding shares by single person or persons acting as group	9.80%
Percentage of ownership restrictions	25.00%
Percentage of REIT taxable income computed without regard to the dividends paid deduction and net capital gains	90.00%
Series Q Preferred Stock [Member]
Shareholders Equity [Line Items]
Preferred stock dividend rate percentage	8.54%	8.54%
Stock repurchased during period, shares | shares	200,000
Loss on preferred stock, redemption amount	$ 3,900,000
2012 Long Term Incentive Plan [Member]
Shareholders Equity [Line Items]
Gross proceeds received for the issuance of common stock	32,900,000	$ 39,500,000	$ 18,200,000
At the Market Offering [Member]
Shareholders Equity [Line Items]
Common stock, shares issued | shares			1,700,000
Net proceeds from issuance of common stock			$ 71,500,000
Maximum proceeds from sale of stock	750,000,000
Aggregate sales of stock remaining available	$ 535,200,000
Agents fee percentage	2.00%
Number of designated agents | Agent	6