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Schedule IV - Mortgage Loans on Real Estate (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | Jul. 25, 2014
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Face Amount of Mortgage | $ 5,900 |  |  |  |
Carrying Amount of Mortgage | 0 | $ 0 | $ 0 | $ 5,900 | $ 5,600
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |  |  |
Build To Suit Healthcare Facility [Member] | Phoenix,Arizona [Member] | Second Mortgage [Member] |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Interest Rate (as percent) | 9.00% |  |  |  |
Internal rate of return on exit (as percent) | 22.00% |  |  |  |
Loan bearing interest, terms | 9% Current Interest, 22% internal rate of return on exit |  |  |  |
Final Maturity Date | Jul. 31, 2016 |  |  |  |
Periodic Payment Term | 9.0% interest, paid in cash on the loan during construction and through maturity. Exit fee upon maturity of the loan in an amount sufficient to earn a 22% internal rate of return. |  |  |  |
Prior Lien | $ 0 |  |  |  |
Face Amount of Mortgage | 5,600 |  |  |  |
Carrying Amount of Mortgage | 0 |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |  |  |
Build To Suit Healthcare Facility [Member] | Phoenix,Arizona [Member] | Interim Financing Loan [Member] |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Interest Rate (as percent) | 22.00% |  |  |  |
Loan bearing interest, terms | 22% Current Interest |  |  |  |
Final Maturity Date | Apr. 30, 2016 |  |  |  |
Periodic Payment Term | 22.0% interest per annum through maturity, with all accrued interest and principal payable upon maturity. |  |  |  |
Prior Lien | $ 0 |  |  |  |
Face Amount of Mortgage | 300 |  |  |  |
Carrying Amount of Mortgage | 0 |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |  |  |

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- Definition Maturity date of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column C)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column F -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Description of contractual payment terms of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Includes, but is not limited to, whether mortgage loan is payable at level or varying amount to maturity, balloon payment requirement at maturity, and prepayment penalty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column D -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column D)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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