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Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 28, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Mortgage indebtedness |  | $ 185,004 |  |  | $ 641,082
Repayments of senior notes |  | 947,014 | $ 958,509 |  |
Repayment of outstanding mortgage debt |  | $ 759,970 | $ 434,240 |  |
Loan Agreement | Promissory Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgage indebtedness | $ 1,350,000 |  |  | $ 1,350,000 |
Senior Unsecured Notes with Maturity Dates Ranging from July 2018 to February 2025 [Member] | Promissory Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of senior notes | 900,000 |  |  |  |
Payment on redemption of senior notes | 28,400 |  |  |  |
Senior Unsecured Notes with Maturity Dates Ranging from July 2018 to February 2025 [Member] | Mortgages indebtedness [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of outstanding mortgage debt | 452,500 |  |  |  |
Repayment of unsecured term loan | $ 200,000 |  |  |  |

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