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Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets: |  |  |  |
Cash | $ 529,313 | $ 396,619 | $ 364,494 | $ 425,316
Liabilities and equity: |  |  |  |
Equity | 1,535,777 | 1,304,441 |  |
Total liabilities and shareholders' equity | 2,918,087 | 2,643,943 |  |
Consolidated Joint Venture |  |  |  |
Assets: |  |  |  |
Cash | 1,199 | 1,214 |  |
Other assets | 44 | 37 |  |
Total assets | 1,243 | 1,251 |  |
Liabilities and equity: |  |  |  |
Accrued expenses | 542 | 550 |  |
Equity | 701 | 701 |  |
Total liabilities and shareholders' equity | $ 1,243 | $ 1,251 |  |

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