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Leases - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 ft² | May 31, 2018 ft² | Aug. 31, 2017 ft² extension_period | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 | Aug. 31, 2019 ft²
Leases [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 134,177 | $ 0 |  |  |
Operating lease, liability |  |  |  | 155,246 |  |  |  |
Right-of-use assets recognized in exchange for operating lease liabilities |  |  |  | 57,691 | 0 | $ 0 |  |
Operating lease cost |  |  |  | 14,697 | 7,972 | 4,515 |  |
Operating lease, payments |  |  |  | $ 8,400 |  |  |  |
Weighted average remaining lease term |  |  |  | 10 years 1 month 6 days |  |  |  |
Weighted average discount rate, percent |  |  |  |  |  |  | 5.90% |
Deferred rent |  |  |  |  | 9,300 |  |  |
Variable lease cost |  |  |  | $ 6,408 | 4,497 | 3,077 |  |
Total lease costs |  |  |  | $ 21,105 | $ 12,469 | $ 7,592 |  |
ARE-San Francisco No. 19, LLC | Mission Bay Lease |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |
Lease space | ft² |  |  | 148,263 |  |  |  |  |
Number of consecutive 5 year terms to extend lease | extension_period |  |  | 2 |  |  |  |  |
Lease extension term |  |  | 5 years |  |  |  |  |
Leased space delivered | ft² |  |  |  | 13,907 |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 6,700 |  |  |  |
Operating lease, liability |  |  |  | 6,700 |  |  |  |
Additional space required to be leased in the future | ft² |  |  | 4,940 |  |  |  |  |
Kilroy Realty Finance Partnership, L.P | Third Street Lease |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |
Lease space | ft² |  | 135,936 |  |  |  |  |  | 67,105
Leased space delivered | ft² | 1,726 | 67,105 |  |  |  |  |  |
Right-of-use assets recognized in exchange for operating lease liabilities |  |  |  | $ 51,000 |  |  |  |

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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 + Details
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