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Commitments and Contingencies - Additional Information (Details) ft² in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) ft² Property | Dec. 31, 2016 USD ($) ft² Property | Dec. 31, 2015 USD ($) | Apr. 03, 2017 ft² Property
Other Commitments [Line Items] |  |  |  |
Number of industrial properties | Property | 488 |  |  |
Outstanding amount of letters of credit and performance bonds in the aggregate | $ | $ 20,188 |  |  |
Gross leasable area (GLA) of industrial properties | ft² | 60,200 |  |  |
Insurance Deductible | $ | $ 25 |  |  |
Operating and ground lease expense | $ | $ 1,419 | $ 1,380 | $ 1,281 |
Leases with purchase options |  |  |  |
Other Commitments [Line Items] |  |  |  |
Number of industrial properties | Property | 4 |  |  |
Development Activity |  |  |  |
Other Commitments [Line Items] |  |  |  |
Number of industrial properties | Property | 11 |  |  |
Gross leasable area (GLA) of industrial properties | ft² | 4,200 |  |  |
Estimated total investment | $ | $ 291,000 |  |  |
Estimated total investment remaining to be funded | $ | $ 175,800 |  |  |
2016 Fire |  |  |  |
Other Commitments [Line Items] |  |  |  |
Number of industrial properties | Property |  | 1 |  |
Gross leasable area (GLA) of industrial properties | ft² |  | 30 |  |
2017 Fire |  |  |  |
Other Commitments [Line Items] |  |  |  |
Number of industrial properties | Property |  |  |  | 1
Gross leasable area (GLA) of industrial properties | ft² |  |  |  | 80

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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 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://www.xbrl.org/2003/role/presentationRef -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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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