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Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Mortgage notes payable | $ 2,599,013,000 | $ 2,385,470,000
Debt instrument, maturity date | Jan. 10, 2022 |
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable | $ 3,100,000 |
Debt instrument, maturity date | May 28, 2061 |
Write off of deferred debt issuance cost | $ 1,500,000 |
Write off unamortized (premium) discount | $ 15,100,000 |
Weighted average interest rate | 4.01% |
Mortgages [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 0.10% |
Mortgages [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 5.78% |
Variable Rate Construction Mortgage [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, maturity date | Jun. 25, 2022 |
Variable rate of construction mortgage debt | $ 7,500,000 |
Total commitment amount | 67,600,000 |
Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | $ 95,500,000 |
Debt Instrument Maturity year | 2036 |
Credit enhanced debt [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable | $ 345,000,000.0 |
Fannie Mae Pool 3 [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from issuance of long-term debt | $ 288,100 |
Debt instrument, maturity date | Mar. 01, 2029 |
Debt instrument, interest rate, stated percentage | 3.94% |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit 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 Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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=6876686&loc=d3e534808-122878 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 + Details
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