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Leases - Additional Information (Detail) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 ft² space | Aug. 31, 2017 ft² extension_period | Sep. 30, 2019 USD ($) ft² | Sep. 30, 2018 USD ($) | Aug. 31, 2019 ft² | Jun. 30, 2018 ft² | May 31, 2018 ft²
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use assets recognized in exchange for lease liabilities |  |  | $ 56,025 | $ 0 |  |  |
Cash paid for amounts included in the measurement of lease liabilities |  |  | $ 5,100 |  |  |  |
Operating lease liability, weighted-average remaining lease term |  |  | 10 years 3 months 18 days |  |  |  |
Operating lease liability, weighted-average discount rate, percent |  |  | 5.90% |  |  |  |
ARE-San Francisco No. 19, LLC | Mission Bay Lease |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Lease space (in sq. feet) | ft² |  | 145,085 | 10,729 |  |  |  |
Number of consecutive 5 year terms to extend lease | extension_period |  | 2 |  |  |  |  |
Lease extension term |  | 5 years |  |  |  |  |
Additional space required to be leased in the future (in sqft) | ft² |  | 8,000 |  |  |  |  |
Operating lease right-of-use assets recognized in exchange for lease liabilities |  |  | $ 5,000 |  |  |  |
Kilroy Realty Finance Partnership, L.P | Third Street Lease |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Lease space (in sq. feet) | ft² | 67,105 |  |  |  | 67,105 | 1,726 | 135,936
Lease extension term |  |  |  |  |  |  | 5 years
Operating lease right-of-use assets recognized in exchange for lease liabilities |  |  | $ 51,000 |  |  |  |
Number of additional spaces delivered | space | 2 |  |  |  |  |  |

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- Definition Number of consecutive five year terms to extend lease. + References No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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