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Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities and equity: |  |
Equity | $ 1,682,316 | $ 1,605,492
Total liabilities and shareholders' equity | 3,089,823 | 2,989,279
Consolidated Joint Venture [Member] |  |
Assets: |  |
Cash | 335 | 1,069
Other assets | 0 | 37
Assets related to consolidated variable interest entity | 335 | 1,106
Liabilities and equity: |  |
Accrued expenses | 290 | 487
Equity | 45 | 619
Total liabilities and shareholders' equity | $ 335 | $ 1,106

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