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Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets: |  |  |  |
Cash | $ 667,863 | $ 396,619 | $ 425,316 | $ 545,419
Liabilities and equity: |  |  |  |
Equity | 1,605,492 | 1,304,441 | $ 1,239,165 | $ 1,124,255
Total liabilities and shareholders' equity | 2,989,279 | 2,643,943 |  |
Consolidated Joint Venture |  |  |  |
Assets: |  |  |  |
Cash | 1,069 | 1,214 |  |
Other assets | 37 | 37 |  |
Total assets | 1,106 | 1,251 |  |
Liabilities and equity: |  |  |  |
Accrued expenses | 487 | 550 |  |
Equity | 619 | 701 |  |
Total liabilities and shareholders' equity | $ 1,106 | $ 1,251 |  |

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