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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 20, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |
Long-term debt outstanding |  | $ 1,610,774,000 | $ 1,560,333,000
Letters of credit, outstanding amount |  | 27,700,000 | 19,700,000
Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount |  | 531,885,000 |
Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  | 23,484,000 |
Derivative, notional amount |  | 42,564,000 |
Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount |  | 182,748,000 |
Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount |  | 156,900,000 |
Interest Rate Swaps |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount |  | $ 100,000,000 |
Derivative fixed interest rate |  | 2.60% |
Interest Rate Swaps | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount |  | $ 0 |
Unsecured Debt | Fund IV | Letter of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit, outstanding amount |  | 7,400,000 | 7,400,000
Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  |  | 383,000
Unsecured Notes Payable | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt available balance |  | 114,500,000 | 62,300,000
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  | 40,000,000 | 40,000,000
$300 Million Term Loan | Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 300,000,000 |  |
$350 Million Term Loan | Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 350,000,000 |  |
Long-term debt outstanding |  | 350,000,000 | 350,000,000
$350 Million Term Loan | Unsecured Debt | Core Portfolio | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.25% |  |
Term Loan Maturing In September 2020 | Secured Debt | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 40,000,000 |
Long-term line of credit, noncurrent |  | 40,000,000 | 40,000,000
Remaining borrowing capacity |  | 0 | 0
Bridge facility | Unsecured Debt | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 41,800,000 |
Long-term line of credit, noncurrent |  | 40,800,000 | 40,800,000
Remaining borrowing capacity |  | 1,000,000 | 1,000,000
Subscription Line | Unsecured Debt | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 21,500,000 |
Long-term line of credit, noncurrent |  | 0 | 0
Remaining borrowing capacity |  | 14,100,000 | 14,100,000
Subscription Line | Unsecured Debt | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 150,000,000 |
Long-term line of credit, noncurrent |  | 50,600,000 |
Remaining borrowing capacity |  | 99,400,000 |
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  | $ 50,600,000 | 102,800,000
Remaining borrowing capacity |  |  | $ 47,200,000
Subscription Line | Unsecured Debt | Fund Portfolio | LIBOR | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.60% | 1.60%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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=109500613&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=6879938&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion 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=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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