Assets Held for Sale or Contribution - Summary of Assets Held for Sale or Contribution (Detail) ft² in Thousands, $ in Thousands	Jun. 30, 2020 USD ($) ft² Property	Dec. 31, 2019 USD ($) ft² Property
Long Lived Assets Held For Sale [Line Items]
Total assets held for sale or contribution	$ 1,948,508	$ 720,685
Total liabilities associated with assets held for sale or contribution – included in Other Liabilities	$ 50,490	$ 41,994
Disposal Group Held for Sale Not Discontinued Operations [Member]
Long Lived Assets Held For Sale [Line Items]
Number of operating properties \| Property	154	28
Square feet \| ft²	24,300	9,371

Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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