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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) lease | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) lease | Sep. 30, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |
Number of leases | lease | 4 |  | 4 |
Expenses incurred for the properties listed |  | $ 0.1 |  | $ 0.4
Property operating expense |  |  |  |
Other Commitments [Line Items] |  |  |  |
Operating Lease, Cost | $ 0.1 |  | $ 0.4 |
Line of credit |  |  |  |
Other Commitments [Line Items] |  |  |  |
Letters of credit, outstanding | $ 8.3 |  | $ 8.3 |

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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X
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X
- Definition Number of separate real estate development properties located on land subject to ground leases. + References No definition available. + Details
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X
- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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