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Notes Payable and Other Debt - Narrative (Details) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Nov. 30, 2015 USD ($) | Dec. 01, 2014 USD ($) | Sep. 30, 2018 | Feb. 28, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Mar. 31, 2018 | Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) | Aug. 31, 2017 | Mar. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 20, 2013 USD ($) | Sep. 17, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 687,300,000 |  |  | $ 705,200,000 |  |  |  |  |  |  |  |  |
Collateral amount |  |  |  |  |  | 375,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Wells Fargo Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings (payments) on line-of-credit agreement, net |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (percent) |  |  |  |  |  |  |  | 3.14% |  |  |  |  |  |  |  |  |  |
Pearl City |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,300,000
Secured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 218,100,000 |  |  | 223,300,000 |  |  |  |  |  |  |  |  |
Secured debt | Kailua Town Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000.0 |
Fixed interest rate (percent) |  |  |  |  |  | 5.95% |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 9,800,000 |  |  | 10,200,000 |  |  |  |  |  |  |  |  |
Secured debt | Kailua Town Center | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |
Secured debt | Kailua Town Center #2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |
Total debt |  |  |  |  |  | $ 4,500,000 |  |  | 4,600,000 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.15% |  |  |  | 3.15% |  |  |
Secured debt | Mortgage Secured by Laulani Village |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 62,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.93% |  |  |  |  |  |  |  |  |  |  |
Interest only payments, amount |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Principal and interest payment, amount |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Secured debt | Refinanced Loan, Maturity 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 92,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and interest payment, amount |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balloon payment to be paid |  | $ 73,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured debt | LIBOR plus 1.35%, payable through 2029, secured by Manoa Marketplace |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 60,000,000.0 |  |  |  |  |  |  |  |  |  |
Balloon payment to be paid |  |  |  |  |  |  |  | $ 41,700,000 |  |  |  |  |  |  |  |  |  |
Secured debt | LIBOR plus 1.35%, payable through 2029, secured by Manoa Marketplace | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 1.35% |  |  |  |  |  |  |  |  |  |
Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | 358,200,000 |  |  | 383,200,000 |  |  |  |  |  |  |  |  |
Unsecured debt | Prudential Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |  |
Unsecured debt | Pru Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant compliance, debt to total assets ratio |  |  | 0.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in interest rate (percent) |  |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured debt | Term Loan 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 25,000,000.0 | $ 25,000,000.0 |  | 25,000,000.0 |  |  |  | $ 25,000,000.0 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.30% |  |  |  |  |  |  | 4.30% |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 111,000,000.0 |  |  | 98,700,000 |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | 111,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  | 337,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | GLP Asphalt revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  | $ 30,000,000.0 |  | $ 30,000,000.0 |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  |  |  |  |  |
Covenant compliance, debt to total assets ratio |  |  |  |  | 0.6 |  |  |  |  |  |  |  |  | 0.5 |  |  |  |
Increase (decrease) in interest rate (percent) |  |  | (0.25%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused capacity fee (percent) |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maximum amount of priority debt |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Covenant compliance, minimum shareholders' equity amount |  |  |  |  | $ 850,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held (percent) |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | GLP Asphalt revolving credit facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
A&B Revolver | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 350,000,000.0 |  |  |  | $ 450,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncommitted increase option | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sub limit for the issuance of standby and commercial letters of credit | 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sub limit for swing line loans | $ 80,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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