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Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Condensed Combined Balance Sheets |  |
Land | $ 2,208,102 | $ 2,208,468
Buildings | 6,988,655 | 7,087,040
Fixtures and tenant improvements | 672,612 | 645,035
Total real estate rental property | 9,869,369 | 9,940,543
Less: Accumulated depreciation | (1,998,760) | (1,909,585)
Real estate rental property, net | 7,870,609 | 8,030,958
Land held for development and construction in progress | 311,005 | 395,242
Total real estate assets, net | 8,181,614 | 8,426,200
Other assets | 401,919 | 451,442
Total assets | 9,225,587 | 9,541,895
Mortgage debt | 1,403,231 | 1,689,805
Total liabilities | 5,778,118 | 5,744,367
Total liabilities and equity | 9,225,587 | 9,541,895
Company's share of accumulated equity | 132,034 | 122,937
Redeemable preferred equity | 309,150 | 305,310
Basis differentials | (43,015) | (12,954)
Deferred development fees, net of portion related to the Company's interest | (2,438) | (2,562)
Amounts payable to the Company | 3,487 | 2,117
Investments in and Advances to Joint Ventures | 399,218 | 414,848
Unconsolidated Joint Ventures [Member] |  |
Condensed Combined Balance Sheets |  |
Land | 1,346,862 | 1,439,849
Buildings | 3,566,004 | 3,854,585
Fixtures and tenant improvements | 184,661 | 200,696
Total real estate rental property | 5,097,527 | 5,495,130
Less: Accumulated depreciation | (770,122) | (773,256)
Real estate rental property, net | 4,327,405 | 4,721,874
Land held for development and construction in progress | 54,209 | 55,698
Total real estate assets, net | 4,381,614 | 4,777,572
Cash and restricted cash | 80,234 | 100,812
Receivables, net | 48,814 | 80,508
Other assets | 346,595 | 394,751
Total assets | 4,857,257 | 5,353,643
Mortgage debt | 3,247,337 | 3,552,764
Notes and accrued interest payable to the Company | 3,031 | 144,831
Other liabilities | 205,924 | 276,998
Total liabilities | 3,456,292 | 3,974,593
Redeemable preferred equity | 309,150 | 305,310
Accumulated equity | 1,091,815 | 1,073,740
Total liabilities and equity | $ 4,857,257 | $ 5,353,643

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