Real Estate - Summary of Acquisition (Detail) - Third parties and a controlling interest [Member] ft² in Thousands, $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2017
USD ($)
ft²
Property
|
Sep. 30, 2016
USD ($)
ft²
Property
|
Sep. 30, 2017
USD ($)
ft²
Property
|
Sep. 30, 2016
USD ($)
ft²
Property
|
|
| Business Acquisition [Line Items] | ||||
| Number of operating properties | Property | 12 | 1 | 14 | 7 |
| Square feet | ft² | 6,328 | 42 | 6,478 | 931 |
| Acquisition value of net investments in real estate properties | $ | $ 703,686 | $ 16,795 | $ 744,581 | $ 86,840 |