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Mortgages and Notes Payable - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Debt Instrument [Line Items] |  |  |  |
Debt satisfaction gains (charges), net | $ (975,000) | $ 25,150,000 | $ (9,452,000) |
Interest paid, capitalized | $ 4,933,000 | $ 6,062,000 | 3,441,000 |
Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate | 4.60% | 4.90% |  |
Debt satisfaction gains (charges), net | $ (7,000) | $ 4,128,000 | (6,657,000) |
Unsecured Credit Agreement [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 905,000,000
Line of credit facility, maximum borrowing capacity with lender approval |  |  |  | $ 1,810,000,000
Minimum [Member] | Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 2.20% |  |  |
Effective interest percentage |  | 2.20% |  |
Maximum [Member] | Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 7.80% |  |  |
Effective interest percentage |  | 7.80% |  |
LCIF [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate | 4.70% |  |  |
Debt satisfaction gains (charges), net | $ (7,388,000) | $ (33,000) | (357,000) |
Interest paid, capitalized | 954,000 | 152,000 | 60,000 |
Co-borrower debt | 146,404,000 | $ 201,106,000 |  |
LCIF [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage |  | 4.00% |  |
Face amount |  | $ 110,000,000 |  |
LCIF [Member] | Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt satisfaction gains (charges), net |  | $ 33,000 | $ 357,000 |
LCIF [Member] | Unsecured Credit Agreement [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 905,000,000 |  |  |
Line of credit facility, maximum borrowing capacity with lender approval | $ 1,810,000,000 |  |  |
LCIF [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 4.00% | 4.00% |  |
LCIF [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 6.50% | 6.50% |  |

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