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Debt - Debt Summary (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 2.60% | 2.70%
Debt | $ 10,706,139 | $ 11,089,815
Credit Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 1.50% | 3.40%
Debt | $ 26,180 | $ 50,500
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 2.70% | 2.70%
Debt | $ 8,314,678 | $ 8,304,147
Term Loans and Unsecured Other [Member] |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 0.90% | 1.80%
Debt | $ 1,411,343 | $ 1,921,428
Secured Mortgage [Member] |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.30% | 5.10%
Debt | $ 953,938 | $ 813,740

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