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Real Estate Investments - Co-Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) unit | Nov. 30, 2018 USD ($) unit | Oct. 31, 2018 USD ($) unit | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) unit | Dec. 31, 2017 USD ($) unit | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Promote interest earned |  |  |  | $ 20,500 |  |  |
Number of units acquired | unit |  |  |  |  | 166 |  |
Acquisitions of real estate and acquisition related capital expenditures |  |  |  |  | $ 15,311 | $ 206,194 | $ 315,632
Revenues |  |  |  |  | 1,400,053 | 1,363,899 | 1,294,001
Purchase Price |  |  |  |  | 35,400 |  |
Gain on remeasurement of co-investment |  |  |  |  | 1,253 | 88,641 | 0
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 1,300,140 |  |  |  | 1,300,140 | 1,119,258 |
Membership Combined Balance Sheets [Abstract] |  |  |  |  |  |  |
Rental properties and real estate under development | 454,629 |  |  |  | 454,629 | 355,735 |
Other liabilities | $ 33,375 |  |  |  | 33,375 | 33,132 |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |
Interest expense |  |  |  |  | (220,492) | (222,894) | (219,654)
General and administrative |  |  |  |  | (53,451) | (41,385) | (40,751)
Equity income from co-investments |  |  |  |  | 89,132 | 86,445 | 48,698
Investments With Related Parties [Member] |  |  |  |  |  |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |
Equity income from co-investments |  |  |  |  | 2,000 | 1,900 | 3,400
Rental and other property [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 1,390,870 | 1,354,325 | 1,285,723
Meridian At Midtown [Member] | Wesco V [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of units acquired | unit |  |  | 218 |  |  |  |
Acquisitions of real estate and acquisition related capital expenditures |  |  | $ 104,000 |  |  |  |
Mortgage debt assumed |  |  | $ 69,900 |  |  |  |
Effective interest rate of mortgage debt assumed |  |  | 4.50% |  |  |  |
Enclave At Town Square [Member] | BEXAWE, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of units sold | unit |  | 124 |  |  |  |  |
Gain on sale of properties |  | $ 5,400 |  |  |  |  |
Repayments of debt |  | 16,100 |  |  |  |  |
Enclave At Town Square [Member] | BEXAWE, LLC [Member] | Rental and other property [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 30,500 |  |  |  |  |
The Summit [Member] | Wesco III [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of units sold | unit |  | 125 |  |  |  |  |
Gain on sale of properties |  | $ 5,200 |  |  |  |  |
Repayments of debt |  | 15,600 |  |  |  |  |
The Summit [Member] | Wesco III [Member] | Rental and other property [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues |  | 34,800 |  |  |  |  |
Marquis [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership Percentage | 49.90% |  |  |  |  |  |
Purchase Price | $ 35,400 |  |  |  |  |  |
Encumberance of mortgage debt |  | $ 45,800 |  |  |  |  |
Number of units in real estate property | unit | 166 |  |  |  | 166 |  |
Gain on remeasurement of co-investment | $ 1,300 |  |  |  |  |  |
Total operating co investments [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 833,270 |  |  |  | $ 833,270 | $ 780,332 |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |
Number of apartments owned through joint ventures | unit | 10,613 |  |  |  | 10,613 | 10,810 |
CPPIB [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 54.00% |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 482,507 |  |  |  | $ 482,507 | $ 500,287 |
Wesco I, III, IV and V [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 52.00% |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 194,890 |  |  |  | $ 194,890 | 214,408 |
BEXAEW, BEXII and BEX III [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 50.00% |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 121,780 |  |  |  | $ 121,780 | 13,827 |
BEX II [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | (36,700) |  |  |  | $ (36,700) |  |
Other [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 51.00% |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 34,093 |  |  |  | $ 34,093 | 51,810 |
Total development co investments [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 50.00% |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 94,060 |  |  |  | $ 94,060 | $ 73,770 |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |
Number of apartments owned through joint ventures | unit | 814 |  |  |  | 814 | 814 |
Total preferred interest investments [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 372,810 |  |  |  | $ 372,810 | $ 265,156 |
Total preferred interest investments [Member] | Investments in Majority-owned Subsidiaries [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 51,800 |  |  |  | 51,800 | 15,700 |
Total co investment [Member] |  |  |  |  |  |  |
Membership Combined Balance Sheets [Abstract] |  |  |  |  |  |  |
Rental properties and real estate under development | 4,367,987 |  |  |  | 4,367,987 | 3,722,778 |
Other assets | 104,119 |  |  |  | 104,119 | 110,333 |
Total assets | 4,472,106 |  |  |  | 4,472,106 | 3,833,111 |
Debt | 2,190,764 |  |  |  | 2,190,764 | 1,705,051 |
Other liabilities | 106,316 |  |  |  | 106,316 | 45,515 |
Equity | 2,175,026 |  |  |  | 2,175,026 | 2,082,545 |
Total liabilities and equity | 4,472,106 |  |  |  | 4,472,106 | 3,833,111 |
Company's share of equity | $ 1,300,140 |  |  |  | 1,300,140 | 1,155,984 |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |
Property revenues |  |  |  |  | 332,164 | 312,841 | 289,011
Property operating expenses |  |  |  |  | (107,584) | (110,583) | (99,637)
Net operating income |  |  |  |  | 224,580 | 202,258 | 189,374
Gain on sale of real estate |  |  |  |  | 24,218 | 90,663 | 28,291
Interest expense |  |  |  |  | (63,913) | (62,844) | (46,894)
General and administrative |  |  |  |  | (6,379) | (9,091) | (7,448)
Depreciation and amortization |  |  |  |  | (126,485) | (118,048) | (103,986)
Net income |  |  |  |  | 52,021 | 102,938 | 59,337
Company's share of net income |  |  |  |  | $ 89,132 | $ 86,445 | $ 48,698

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