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Commitments and Contingencies - Additional Information (Details) $ in Thousands, ft² in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) ft² Property | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other Commitments [Line Items] |  |  |
Number of industrial properties | Property | 458 |  |
Outstanding amount of letters of credit and performance bonds in the aggregate | $ 18,573 |  |
Gross leasable area (GLA) of industrial properties | ft² | 63.1 |  |
Operating and ground lease expense | $ 1,566 | $ 1,419 | $ 1,380
Leases with purchase options |  |  |
Other Commitments [Line Items] |  |  |
Number of industrial properties | Property | 5 |  |
Development Activity |  |  |
Other Commitments [Line Items] |  |  |
Number of industrial properties | Property | 7 |  |
Gross leasable area (GLA) of industrial properties | ft² | 2.8 |  |
Estimated total investment | $ 189,400 |  |
Estimated total investment remaining to be funded | $ 140,300 |  |

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- Definition Estimated total investment remaining to be funded of industrial properties under construction. + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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