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Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities and equity: |  |
Equity | $ 1,607,571 | $ 1,605,492
Total liabilities and shareholders' equity | 3,009,395 | 2,989,279
Consolidated Joint Venture [Member] |  |
Assets: |  |
Cash | 1,128 | 1,069
Other assets | 37 | 37
Assets related to consolidated variable interest entity | 1,165 | 1,106
Liabilities and equity: |  |
Accrued expenses | 484 | 487
Equity | 681 | 619
Total liabilities and shareholders' equity | $ 1,165 | $ 1,106

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